1ADJ-GRADED [verb-link ADJ, oft ADJ that/wh]肯定的;有把握的;毫无疑问的 If you are certain about something, you firmly believe it is true and have no doubt about it. If you are not certain about something, you do not have definite knowledge about it. 肯定的;有把握的;毫无疑问的 [Also + about]
She's absolutely certain she's going to make it in the world.
她坚信自己会出人头地。
We are not certain whether the appendix had already burst or not.
我们不敢肯定阑尾是否已经破裂。
It wasn't a balloon — I'm certain of that. [+ of]
那不是气球，这点我敢肯定。
SYN sure, convinced, positive, confident
2ADJ-GRADED [oft ADJ to-infinitive]必然的;必定的;肯定的 If you say that something is certain to happen, you mean that it will definitely happen. 必然的;必定的;肯定的
However, the scheme is certain to meet opposition from fishermen's leaders.
然而，这项计划一定会遭到渔民领袖的反对。
It's not certain they'll accept the Front's candidate if he wins.
即便来自阵线的候选人获胜，他们能否接受他还说不准。
Brazil need to beat Uruguay to be certain of a place in the finals. [+ of]
巴西必须击败乌拉圭才能确保进入决赛。
The Prime Minister is heading for certain defeat if he forces a vote.
总理要是强迫进行投票的话，那么他必败无疑。
Victory looked certain.
胜利在望。
3ADJ [verb-link ADJ]确凿的；无疑的 If you say that something is certain, you firmly believe that it is true, or have definite knowledge about it. 确凿的；无疑的
One thing is certain, both have the utmost respect for each other.
有一点可以肯定，那就是双方都非常尊重对方。
It is certain that Rodney arrived the previous day.
罗德尼肯定是头天到的。
SYN known, true, positive, plain
4ADJ-GRADED [ADJ n]确实的;肯定的 If you have certain knowledge, you know that a particular thing is true. 确实的;肯定的
He had been there four times to my certain knowledge.
我确定他去过那儿4次。
5PHRASE 确切地;无疑地 If you know something for certain, you have no doubt at all about it. 确切地;无疑地
She couldn't know what time he'd go, or even for certain that he'd go at all.
她不知道他何时走，就连他到底走不走都说不准。
Hill had to find out for certain.
希尔得弄个清楚。
6PHRASE 确保；保证 If you make certain that something is the way you want or expect it to be, you take action to ensure that it is. 确保；保证
Firstly, they must make certain that their pension needs are adequately catered for.
首先，他们得确保他们能获得足够的养老金。
To make extra certain, a police helicopter kept watch from the skies.
1ADJ [ADJ n]某个;特定的 You use certain to indicate that you are referring to one particular thing, person, or group, although you are not saying exactly which it is. 某个;特定的
There will be certain people who'll say 'I told you so!'.
一定有人会说：“我怎么跟你说来着！”
You owe a certain person a sum of money.
你欠某人一笔钱。
Leaflets have been air dropped telling people to leave certain areas.
传单被空投下来，要求人们离开某些地区。
2QUANT 某些;一些 When you refer to certain of a group of people or things, you are referring to some particular members of that group. 某些;一些 [formal]
They'll have to give up completely on certain of their studies. [+ of]
他们将不得不彻底放弃某些研究。
3ADJ (用于人名前，表示不认识或了解很少)某个 You can use a certain before the name of a person in order to indicate that you do not know the person or anything else about them. (用于人名前，表示不认识或了解很少)某个
She managed to arrange for them to be hidden in the house of a certain Father Boduen.
她设法安排他们藏在一个叫博迪恩的神父家里。
4ADJ (品质、特点等)一定程度上的，有点儿 You use a certain to indicate that something such as a quality or condition exists, and often to suggest that it is not great in amount or degree. (品质、特点等)一定程度上的，有点儿
That was the very reason why he felt a certain bitterness.
那就是为什么他感到有些痛苦。
There is a certain impatience among some of the soldiers.
有些士兵有点儿不耐烦。
I received a certain amount of sympathy immediately after the attack.