单词 | just behind | ||
释义 |
例句释义: 全部 1. A father's love can be compared to a mountain. Although we do not look at it everyday, when you fall down, it's just behind you. 父爱像一座高山。虽然我们不必每天仰望,,可是跌倒。 tag.blog.sohu.com 2. But there it was, that flicker of hubris, hiding just behind his explanation of the decision to tell all (or at least some). 然而,又是这样,在解释为什么下定决心要把事情都说出来(或者至少交代一部分)的时候,他的言语间若隐若现地总是有点傲慢。 cn.nytimes.com 3. You know, from what I hear, dogfighting is a sport. It's just behind closed doors. 我所了解到的是,斗狗是一项运动,只不过不为人熟知罢了。 epaper.bjnews.com.cn 4. There is a feeling that Rooney must play as a centre forward, or just behind one, if United and England are to get the best out of him. 大家都觉得如果曼联或者英格兰想从他身上得到最多好处的话鲁尼必须打中路,或者至少是影子前锋。 bbs.sports.sina.com.cn 5. Murdoch leapt quickly to her feet from her chair just behind her husband, swung her arm in a great arch and punched the protester. 默多克太太飞快地从丈夫身后的座椅上起身,大幅摆动手臂,给了袭击者一巴掌。 dongxi.net 6. She turned slowly. An old, white battered truck sat on her perfectly manicured lawn just behind her. The engine was hot and grumbling. 她慢慢转过身,一辆白色的老破卡车就停在她身后精心修剪的草坪上。引擎还热着,发着吼声。 suddenlysummer.spaces.live.com 7. With me just in front of Javier Mascherano and Steven Gerrard just behind the front man, we now have even more solutions in midfield. 我在马斯切拉诺身前,史蒂芬顶在我前面,我们现在中场已经找到解决的办法。 www.jczqw.com 8. It was a low sound, her voice, very close to the quiet rustling of the water against the reeds just behind her. 她轻声低语。她的声音很轻,几乎就像是河水流过她身后芦苇时的潺潺扰动。 www.cndkc.net 9. Then he points to another section of the brain, in the front part of the brain, just behind the eyes. 然后,他指着大脑前部,眼睛后边的一个地方。 www.bing.com 10. Just behind the entrance-door was a little basket made f reeds, containing the withered body of a new-born infant, wrapped in rags. 在入口的背后,是一具用芦韦制作的小棺椁,躺著一位新生婴儿的枯萎身体,用破布包裹著。 springhero.wordpress.com 1. The voice was no more than a whisper, yet somehow Dany felt that he was walking just behind her. 虽然只是一声细语,但是丹妮感觉他就在她的身后。 www.cndkc.net 2. You've only to test the truth of this fact about the newness of life to discover the incredible freedom that waits for you just behind it. 要发现生活背后等待着你的无穷自由,只有去验证生活中新事物的真相。 www.bing.com 3. He added: "I enjoyed it a lot. I have always said my favourite and best position is playing up front just behind the striker. " 小丹尼表示:“很感谢教练对我的这一安排。我常常都说前腰位置才是我能够发挥最给力的位置。” www.lfcbbs.com 4. The preset regeneration control can be seen just behind the front panel. 被预先设定的再生控制可能被在前面嵌板后面仅仅调查。 www.crystalradio.cn 5. Behind it was a large den that connected to the dining area and kitchen, with a laundry room off it just behind the garage. 再往后去是一个很大的书房,同吃饭的地方和厨房相连。房子突出来的地方是个洗衣间,就在车库后面。 blog.sina.com.cn 6. The next plan is to dig a hole in the trench just behind the pit and fill it with an absorbent polymer. 下一步计划是在裂缝后的沟渠上挖一个洞,用吸收剂聚合物填充。 www.voanews.com.cn 7. It's easy to do. The trips launch from the docks just behind the contemporary resort. 从这儿你可以到现代旅游胜地的后面尽情享受美味的午餐。 www.njjhw.com 8. It lies near the surface of the brain, just behind the right ear. 它靠近大脑表层,就在右耳后面。 www.bing.com 9. And thus I MADE me a cave just behind my tent, which serv'd me like a cellar to my house. 这样,帐篷算是我的住房,房后的山洞就成了我的地窖。 dict.ebigear.com 10. China now ranks third on GERD, just behind the US and Japan and ahead of any individual European Union state. 中国的GRED已列世界上的第三位,仅次于美国和日本,排在各个欧洲共同体国家的前头。 www.bing.com 1. One half sits in the left hemisphere and one in the right, just behind and a bit below the eyes. 其中一个一半位于左脑半球,另一个在右边,刚好在眼睛后面偏下一点的位置。 www.zftrans.com 2. and, finally, a pair of horizontal stabilizers appear from just behind the rear wheels. 最终,两个水平稳定翼会从后轮后面现身。 bbs.cnnas.com 3. And if they were starting just behind you at the first corner you were not going to come first. 如果他们在你后排起步的话很有希望在第一弯超过你。 bbs.hellof1.com 4. Cameron's Titanic ranks sixth (just behind The Ten Commandments) with an adjusted $943 million take in the U. S. 卡梅隆的《泰坦尼克》排行第六(排在《十诫》之后),按通货膨胀调节后的票房为9.43亿美元。 www.bing.com 5. The hair down the middle of the back, starting just behind the cape and continuing over the rump, lies flat. 背部中间以下的毛发(从披肩后面开始,延伸到臀部)平贴身躯。 www.3316.cn 6. Laughing, the man pushed it with his naked toes, and presently picked it up again, holding it just behind the head. 那人大笑着,用他的光脚趾推推蛇,又很快把它捡起来,盘在头后。 hi.baidu.com 7. Andy can keep hold of the ball so well and can challenge for everything, Luis can play just behind him and he has a lot of skill. 安迪能够控球控得非常好,同时能够挑战任何东西。路易斯可以就在他身后踢球,而他有着非常多的技巧。 www.lfcbbs.com 8. When Spitz caught the rabbit, throwing it in the air with his teeth, Buck was just behind. 斯皮兹抓着了兔子。它把兔子叼起来抛向空中。这时,巴克正紧随其后。 www.thnu.edu.cn 9. FLORENCE - 'We are not in a crisis and the fact that we are just behind Juventus in the standings confirms this'. 佛罗伦萨-“我们没有什么危机,而且我们紧随尤文图斯排名积分榜第二更是证明了这一点。” www.bing.com 10. bad weather . since long long time ago, but sunshine just behind the clouds , if you want to see them , that's fine . 坏天气。因为很久很久以前,阳光只是在云层的后面,但如果你想看他们,这很好。 zhidao.baidu.com 1. Most infections happen in the middle ear, a pocket about the size of a small grape located just behind the eardrum . 绝大多数感染发生在中耳,一个小口袋大约有小葡萄一样大小,位于耳鼓后面。 www.showxiu.com 2. It's located just behind our main courtyard, so much closer than the river we used to walk to. 它就在我们主宅的后边,所以比我们经常去的小河近多了。 www.di2jiayuan.com 3. The shot is clean, and fatal, just behind the front leg. 这一枪干净利落,而且是致命的,正好打在前腿的后面。 www.bing.com 4. The checkroom is just behind the front door. 寄存处就在前面。 blog.sina.com.cn 5. So I suppose you think that's a reward for breaking rules? came an angry voice from just behind them. 所以你认为这是对你违反校规的奖励吗?他们俩身后传来一个愤怒的声音。 www.kekenet.com 6. If perspiration is present, continue to hold button depressed, lift probe from forehead and touch the neck just behind the ear lobe. 如若额头有汗水,则继续按按钮将仪器移至脖颈,直至接触耳垂。 0-buy.com 7. The check room is just behind the front door. 寄存处就在前门后面。 www.1stenglish.com 8. Although he emerged just behind Alonso, the seeds for his victory had been sewn. 尽管他出站时还是在阿隆索之后,但他获胜的时机已经成熟。 www.uu80.com 9. Why? Don't you know the place? It's close at hand , just behind the post office. 怎么?你不知道那个地方?就在附近,邮局的后面。 www.kekenet.com 10. I think in Germany we just were just behind the front runners. 我认为在德国我们只是落在了那帮踩狗屎的后面了。 www.barrichello.com.cn 1. Just behind the winner, an automatic sprinkler system based on a standard kitchen tap, was a device designed to make anaesthesia safer. 只是在获奖者的背后,是一种根据标准厨房水龙头设计的自动喷水装置,其将使麻醉的安全性提高。 www.kle100.cn 2. That includes Tottenham who sit just behind us in the league and it promises to be a cracking game at White Hart Lane . 这其中就包括了热刺,在联赛中他们的排名仅次于我们,因此在白鹿巷球场进行的那场比赛必然会非常精彩。 www.bing.com 3. Some people want to kick me, said Liu Xinquan (then Vice Foreign Minister ) was just behind me, to kick me, I'm not afraid! 有人要揪我,说刘新权(当时的外交部副部长)的后面就是我,要揪我,我不怕! yanjiang.com.cn 4. From my position just behind him, I see the teachers cheering him on. 从他后面可以看到,所以的老师都在为他加油。 www.bing.com 5. Enemy states are no longer on the other side of the ocean, but just behind the firewall. 敌对国家已非处在大洋彼岸,而是隐藏在防火墙后面。 www.ecocn.org 6. Beijing is now Cuba's second-largest trading partner, just behind Venezuela. 目前中国是古巴的第二大贸易合作伙伴,仅次于委内瑞拉。 www.bing.com 7. Just behind it, an old-fashioned bicycle has been placed in a glass case. 就在它(恐龙)后面,一辆老款自行车陈列在玻璃箱中。 93ta.com 8. Indeed, a new study ranks mobile eating just behind cellphone use as a cause of distracted-driving accidents. 事实上,一份新的调查显示,开车时进食造成交通事故的危险性仅次于驾车时打电话。 www.chinadaily.com.cn 9. Sirius must be just behind the curtain, he, Harry, would pull him back out. 小天狼星肯定在帘子后面,他,哈利,可以把他拉出来。 club.edu.sina.com.cn 10. Tonight, we are now just sitting in an islet with the famous "Lixia Pavilion" just behind us. 今晚,大家就坐在承载“历下亭”的这个小岛上,著名的历下亭就在大家的身后边。 www.bing.com 1. It is important we keep the nucleus from last season and a nucleus of players who are maybe just behind the first team. 重要的是留住上赛季的核心球员。而这些核心球员,也许也会在一线队阵容以外的。 www.11hero.com 2. Kathy: The hotel is just behind the cinema. Where's the bus stop, please? 凯西:酒店就在电影院的后面。请问车站在哪呢?。 cul.zhishi.sohu.com 3. To cure dandruff, you massage the little spot just behind your big toenail. 要治疗头皮屑,你可以通过按摩大拇趾趾甲背后的一小点区域。 www.bing.com 4. A small car park and toilet block sit just behind, but its hard to imagine it ever getting very busy here. 这里有个小型的停车场和一个公共厕所,但是很难想象这里会有很多来访者。 www.bing.com 5. I really enjoyed the game and Pat Evra was just behind me encouraging me, so it was very good. 我真的很喜欢比赛,埃弗拉就在后面鼓励我,所以真的很好。 forum.sports.sina.com.cn 6. Marilyn Pyke , leader of the church group just behind, arrived minutes later. 玛丽琳。派克教堂小组的领队也在随后几分钟赶到了。 dictsearch.appspot.com 7. The revisions are concentrated on the endplates, in the cut area just behind the flap (red arrows). 这些变化主要集中在端板,即副翼后面的切断面(红色箭头)。 f1.sports.sohu.com 8. He'll play in a central position tomorrow just behind the strikers. 他明天将会打在前锋后面的前腰位置。 www.bing.com 9. The trips launch from the docks just behind the contemporary resort. Just strap yourself in. 这个帆伞之旅从这个码头开始,就在这座同时期的建筑后面。系好安全带吧! www.njjhw.com 10. A LCD projector is placed just behind the camera to project a random dot pattern on the target object. 液晶投影机是放在后面的摄像头项目随机点模式的目标对象。 goabroad.zhishi.sohu.com 1. Clare walked slowly and without purpose. His shape was black and frightening She walked just behind him. 克莱尔漫无目的地缓缓走着,他的身影漆黑吓人。 www.kekenet.com 2. This time Japan, with a deterioration of 34 percentage points, is ahead, and the US, with 27 percentage points, just behind. 这一次,日本领先于英国,增幅为34个百分点,而美国略微落后,增幅为27个百分点。 www.ftchinese.com 3. Just behind the copse stands a delicately transparent pavilion. 仅次于科普斯矗立着微妙的透明亭子。 dndci.com 4. Telbivudine is just behind lamivudine, it also has a substantial resistance rate. 替比夫定仅次于拉米夫定,也有相当的耐药发生率。 www.hbvhbv.com 5. Massage the base of your tongue, in the spongy area just behind your chin bone, above and in front of your Adams apple. 按摩你的舌头底部,下巴骨后边海绵状部分,喉结上面和前端部分。 www.bing.com 6. A rock the size of an egg had caught Bill just behind his left ear. 一块鸡蛋大小的石头正好打到比尔的左耳后。 www.joyen.net 7. The stomach is the tough sack ofwhat look like teeth just behind the head. Don't eat the stomach. 它们的胃在脑后,长得像牙齿的袋子就是。别吃那个。 www.bing.com 8. But now, my hedgehog is sleeping in a conner just behind the shed! 但是现在,我的刺猬就在那个小屋的后面睡觉! hi.baidu.com 9. Serginho is another in sparkling form and is just behind Dida in minutes played in the league, on 756. 塞尔吉尼奥是另外的闪光点,是联赛中出场时间仅次于迪达的球员,756分钟。 www.bing.com 10. The trips launched from the docks just behind the contemporary resort. 这些船下水的码头就在度假村的后面。 www.njjhw.com 1. My favourite position is just behind centre forward, since in that position I can move around more and try to do many things. 我最喜欢踢的位置就是躲在中锋的后面,因为那个位置我可以得到更多的空间,制造更多的机会。 blog.5d.cn 2. But on access to civil justice, America did badly: it came 21st, just behind the Czech Republic and just ahead of Jordan. 但到了民事司法方面,美国的表现却相当糟糕:仅名列第21位,落后于捷克共和国,仅比约旦排名稍前。 www.ecocn.org 3. The 19-year-old was Russia's young player of the year in 2008 after excelling in a role just behind the striker Vagner Love. 这名19岁的球员因在前锋VagnerLove身后位置的卓越表现而当选为俄罗斯2008年度最佳青年球员。 www.bing.com 4. The region, which lies just behind the right ear, becomes more active when we think about other people's misdemeanours or good works. 当我们想到别人的微小错误或好事时,位于右耳背后的部位变得更加活跃。 www.bing.com 5. But there are still some unappealing realities just behind the beautiful facade of Indian democracy. 但就在印度民主的美丽外表之下,仍掩藏着一些不那么美妙的现实。 blog.sina.com.cn 6. I had a gash like a long slug, just behind my ear. 我的耳朵后面划了个口子,血流出了长长一溜。 www.bing.com 7. The trips launch from the docks just behind the contemporary resort. 旅行从当代胜地后面的码头开始。 www.njjhw.com 8. Thomas whooshed into the station with Bertie arriving just behind. "Well done Thomas, you've won the race! " the passengers all cheered. 托马斯风驰电掣的驶入车站,而柏蒂也从后面刚刚赶到。“托马斯好样的!我们比赛胜利了”所有的乘客都欢呼起来。 bbs.redmama.com.cn 9. The revisions are concentrated on the end plates , in the cut area just behind the flap (red arrows). 工程师专注在侧板,襟翼后方被切断的区域(红色箭头处)的更新上。 dictsearch.appspot.com 10. Finally, they ran into the mountains just behind the house and were rarely seen. 后来他们就跑进房子后面的山里,从此就很少见到他们了。 sm2000.org 1. It's the third largest music retailer in the United States, just behind Wal-Mart and Best Buy. iTunes成为了美国第三大音乐零售商,排名仅次于沃尔玛和百思买。 www.bing.com 2. Burundi is the lowest-placed African state, just behind Zimbabwe. 布隆迪是排名最靠后的非洲国家,排在津巴布韦之后。 www.ecocn.org 3. I'd be honoured and privileged to come in just behind him if possible. 能够尽可能的靠近他我就感到非常荣幸了。 www.lfcbbs.com 4. In a battle, a bomb went off just behind him but he survived. 一场战斗中,一颗炮弹就在他身后爆炸而他幸存下来了。 www.ebigear.com 5. Just behind him, French tourists ambled around in bathing suits. 在他身后,身穿泳衣的法国旅游者悠闲地踱步。 www.ftchinese.com 6. the hotel is just behind the cinema. 这个饭店就在电影院后面。 zhidao.baidu.com 7. The cloakroom where you can hang your coat or leave your bags is just behind us here. 衣帽间就在我们后面,你可以在那个挂大衣或放包。 www3.060s.com 8. A smaller house is just behind the main house. 在主房屋后面有一个小一些的房屋。 learning.sohu.com 9. Far? The Town Hall is just behind the subway station! 远?市政大厅就在地铁站的后面。 www.bing.com 10. I was not leading in the first 200 meters, but was just behind the leading man. 我不是主导的在第一200米中,而是是正义的在主导的人之后。 www.bozes.com 1. He was in car number fifteen. Five other cars were just behind him. 他在第15号车里,其他5辆汽车跟在他后面。 www.24en.com 2. the fuselage had broken off just behind the pilot's seat. 机身正好就在飞行员座位后面断裂了。 www.uukkuu.com 3. If you need a drink or something to eat , the cafeteria is just behind the parrot house , so it's a bit noisy . 如果你需要喝点什么吃的,自助餐厅就在其鹦鹉的房子,所以这是个一点噪音。 www.ok177.com 4. But just behind the trees an almost vertical dune was advancing to rebury them. 但是在这些树后那几乎垂直的沙丘还在不断向前推进,不久将再次埋葬它们。 dictsearch.appspot.com 5. 2, But there is one of her sisters sitting down just behind you, who is very pretty, and I dare say very agreeable. 〖译文〗可是她的一个妹妹就坐在你后面,她也很漂亮,而且我敢说,她也很讨人爱。 www.wwenglish.com 6. China's national team is ranked No. 100 by FIFA, just behind Ethiopia and ahead of Tanzania. 中国国家队被国际足联列为排名第100位,仅在埃塞俄比亚后面和在坦桑尼亚前面。 dictsearch.appspot.com 7. library is just behind the animal shop. 图书馆就在宠物商店的后面。 www.nciku.com 8. The flat upper surface of the tongue just behind the tip. 舌尖后平的上部表面 wenwen.soso.com 9. Be sure to post an SCV in Auto-Repair mode just behind each Bunker. 保证每个地堡旁边都跟着一个开着自动修理的SCV。 www.bing.com 10. Alexa ranks Sina as the 7th biggest web property in the world, just behind MySpace. 在Alexa的排名中,新浪是世界上第七大网络公司,仅次于MySpace。 www.bing.com 1. No, it's not far. It's about 500 metres that way, just behind the shopping centre. 不,不远。在那边大约500米处,就在购物中心的后面。 www.trade-college.com 2. They were doing it just behind my back. 他们背着我侮辱他。 blog.photoshopcn.com 3. In 2011, the yuan accounted for roughly 0. 2% for foreign exchange transactions, just behind the Hungarian forint. 2011年,人民币占世界外汇交易总量的大约0.2%,甚至落在匈牙利福林之后。 c.wsj.com 4. It is the frontal lobe, located just behind your forehead. 即:正好位于你脑门后的前额叶。 www.bing.com 5. In the car cace. the French car and the English car were just behind the American car. 在比赛中,法国车和英国车紧随在美国车后。 zhidao.baidu.com 6. Slight tuck-up of belly just behind the ribs. 腹部在肋骨后方略微上提。 www.3316.cn 7. Last year, Chinese carmakers surprised the industry by coming second in terms of aggregate market share, just behind Japanese brands. 去年,中国汽车制造商在总市场份额方面位居次席,仅落后于日本品牌,这令业界感到震惊。 www.ftchinese.com 8. My home is just behind the post office. 邮局的背后就是我家了。 goabroad.zhishi.sohu.com 9. In the Palm-Leaf Culture Village just behind us. Let's go. 就在我们身后的贝叶文化村啊。走。 blog.sina.com.cn 10. Over there, just behind the dock. 在那边,码头的后面。 bbs.chinafund.cn 1. Pacheco wants to play in that position just behind a striker but it's tough because a lot of lads want that spot. 帕切科想要在射手身后的位置踢球,但那是困难的,因为很多球员都想要那个位置。 www.lfcbbs.com 2. China was the second exporter worldwide in 2006 - just behind Germany - and is on the way to becoming number one by 2010. 2006年,中国已成为全球第二大出口国,仅次于德国,并且有望在2010年前坐上头把交椅。 www.ftchinese.com 3. Heaven Bridge, it seem that it is go to Heaven. Green Dragon Gorges Waterfall is just behind the bridge. 通天桥,看起来它象是通往天堂。青龙涧瀑布就在其下面。 www.jd-bbs.com 4. He likes to play just behind the striker or on the right side of midfield. 他喜欢在射手身后或者右中场活动。 forum.sports.sina.com.cn 5. Five other cars were just behind him. 其它五辆汽车紧跟在他后面。 www.tingclass.com 6. Two runners were just behind him. 两个赛跑的人紧跟在他后面。 blog.sina.com.cn 7. I was walking just behind an elderly man who had an umbrella. 我跟在一个打伞的老人身后。 www.bing.com 8. The dormitory is just behind the school library. So you can't miss it. 宿舍就在学校图书錧的正后面。这样你不会找不到的。 blog.soufun.com 9. The spring scenery is just behind you. 春景就在你身后。 www.cctv.com 10. The farm is just behind us. 农场就在我们后面。 zhidao.baidu.com 1. Artists live in such moving trailers that stand just behind a marquee. 艺术家们就住在这些大帐篷后面的移动拖车里。 lfx8.com 2. The tally of 36 four-star officers is just behind America's 41. 泰国共有36位四星级军官,只居于美国的41位的记录之下。 www.ecocn.org 3. One of the biggest gainers from last year to this year is Montenegro, rising from 82nd to 65th place, just behind Turkey and Brazil. 从去年到今年最大的胜利者之一是黑山,它从排名榜上的第82上升到第65位,仅次于土耳其和巴西。 dictsearch.appspot.com 4. B: Just behind you. 就在你的身后。 www.examw.com 5. He sat just behind me. 他就坐在我后面。 yingyu.eduu.com 6. The Chinese economy is currently the third largest in the world measured in dollar terms, just behind Japan. 按美元计算,中国目前是全球第三大经济体,仅次于日本。 www.ftchinese.com 7. What is your favourite position? Right midfielder, just behind the striker? 你最喜欢踢的位置的什么?右中场?还是前锋身后的影子杀手? blog.5d.cn 8. Certainly. It's just behind the library. 对它就在图书馆后面。 wenku.baidu.com 9. Casino operators in the Chinese territory booked gross revenues of $3. 1bn in the first half, only just behind the $3. 3bn on the Strip. 今年上半年,在这块中国的土地上,赌场经营者录得收入31亿美元,仅略低于拉斯维加斯的33亿美元。 www.ftchinese.com 10. She is sitting just behind you. 她就坐在你后面。 www.kekenet.com 1. the cimema is just behind the park . 电影院就在公园后面 wenwen.soso.com 2. Yet last year, Chinese brands had 26. 4 per cent of the market, putting them just behind the Japanese. 但在去年,中国汽车品牌已占有26.4%的市场份额,仅次于日本品牌。 www.ftchinese.com 3. Last year, Chinese brands won 26. 5 per cent of sales, putting them just behind Japanese cars in the national rankings. 去年,中国品牌已经赢得26.5%的销售市场,在全国销售排名中仅次于日本车。 www.ftchinese.com 4. he seated himself just behind the desk. 他就坐在课桌后面 zhidao.baidu.com 5. It was just behind of wall of eight-back 就八背墙背后高地那里嘛 blog.sina.com.cn 6. it hung over the roof, just behind the chimney 它挂在屋顶上就是烟囱后面 zhidao.baidu.com 7. But always just behind the smile 但始终只是微笑背后 zhidao.baidu.com 8. Yeah, there's a big blue sky waiting just behind the clouds 是的,乌云背后总会有蓝天等着你 blog.sina.com.cn 9. There's a shadow just behind me 我的身后有一个影子 blog.sina.com.cn 10. But there's a big blue sky waiting just behind the clouds 但乌云背后总会有蓝天等着你 blog.hjenglish.com 1. The restaurant is just behind the library 饭店在图书馆的后面。 zhidao.baidu.com 2. which was just behind the Liuhua park 也就是在流花公园后面 blog.sina.com.cn |
||
随便看 |
|
英汉双解词典包含2704715条英汉词条,基本涵盖了全部常用单词的翻译及用法,是英语学习的有利工具。