know
/nəʊ/- with clause be aware of through observation, inquiry, or information（通过观察、询问或某种信息）了解, 得知, 知道：
most people know that CFCs can damage the ozone layer
大多数人都知道氯氟烃破坏臭氧层
I know what I'm doing.
我知道我在做什么。
- with obj. have knowledge or information concerning知道有关于…的信息：
I would write to him if I knew his address
如果我知道他的地址我就会给他写信的
no obj. I know of one local who shot himself.我知道一个饮弹自杀的当地人。
- be absolutely certain or sure about something确信, 确知：
I just knew it was something I wanted to do
我就是确信这是我想要做的事
with obj. I knew it!我确信是这样！
- with obj. have developed a relationship with (someone) through meeting and spending time with them; be familiar or friendly with（因经常见面并相处而）、了解（某人）; 熟悉（某人）; 与（某人）关系好：
he knew and respected Laura.
他了解并尊重劳拉。
- have a good command of (a subject or language)懂得, 通晓（学科, 语言）。
- recognize (someone or something)认出：
Isabel couldn't hear the words clearly but she knew the voice.
伊莎贝尔听不清那些话, 但她听出了那声音。
- be familiar or acquainted with (something)熟悉（某事物）：
a little restaurant she knew near Leicester Square.
她所熟悉的莱斯特广场旁边的一家小餐馆。
- have personal experience of (an emotion or situation)经历（情感, 情形）：
a man who had known better times.
有过好日子的人。
- （一般作be known as）regard or perceive as having a specified characteristic认为（或发觉）…具有某种特质：
he is also known as an amateur painter.
他也被认为是一个业余画家。
- （一般作be known as）give (someone or something) a particular name or title赋予（某人, 某物）特定的名字（或称号）, 称呼：
the doctor was universally known as 'Hubert'.
这个医生被普遍称为“休伯特”。
- ( know someone/thing from) be able to distinguish one person or thing from (another)能区分, 能识别：
you are convinced you know your own baby from any other in the world.
你确信能够把自己的孩子和世界上别的小孩区分开来。
- with obj. archaic have sexual intercourse with (someone)〈古〉与（某人）性交。
- ORIGIN: a Hebraism which has passed into modern languages; compare with German erkennen, French connaître.
all one knows
- used to emphasize the limited nature of one's knowledge concerning something（用于强调所知有限）…知道的就只有…：
all I knew was that she was a schoolteacher.
我只知道她是一个教师。
- used to emphasize the importance or significance of the following fact or facts（用于强调所说以下情况十分重要）其他情况就不去管它了, …只想说：
all she knew was that she was cold and hungry and thirsty.
她只知道自己又冷又饿又渴。
and one knows it
- said to emphasize that someone is well aware of a fact although they might pretend otherwise（用于强调某人对某情况十分了解, 但可能会佯作不知）…自己也知道（或心里也清楚）：
the Right Honourable Gentleman's priorities do not add up and he knows it.
议员阁下的优先权不合情理, 他自己也清楚这一点。
- as we know it
- as is familiar or customary in the present正如人们现时所了解（或习以为常）的那样：
apocalyptic expectations, envisaging the end of the world as we know it.
关于大灾难的预想展现着现时人们所熟知的世界末日景象。
before one knows where one is（或before one knows it）
- informal with baffling speed〈非正式〉转眼间。
be in the know
- be aware of something known only to a few people知情的, 知晓内幕的：
he had a tip from a friend in the know: the horse was a cert.
她有一条从知晓内情的朋友那里得来的秘密消息：这匹马定能赢。
be not to know
- have no way of being aware of无法知道：
you weren't to know he was about to die.
你无法知道她快要死了。
don't I know it!
- informal used as an expression of rueful assent or agreement〈非正式〉我何尝不知道。
don't you know
- informal, dated used to emphasize what one has just said or is about to say〈非正式, 旧〉你也知道的：
I was, don't you know, a great motoring enthusiast in those days.
我那时热衷于驾车兜风, 这你也知道的。
for all someone knows
- used to express the limited scope or extent of one's information（用于表示某人所知有限）…才不知道呢; 这就不得而知了：
she could be dead for all I know.
她可能已死了, 我才不知道呢。
God（或goodness 或heaven）knows
- used to emphasize that one does not know something［用于强调自己不知道］天知道：
God knows what else they might find.
天知道他们还能发现什么。
- used to emphasize the truth of a statement［用于强调陈述的真实性］天也知道：
God knows, we deserve a spot of bubbly after all these years.
天也知道, 经过了这么多年我们该来点儿香槟酒了。
I know
- I agree我同意：
'It's not the same without Rosie.''I know.'
“缺少了罗茜就不一样了。”“我知道。”
- （亦作I know what）I have a new idea or suggestion我有个主意, 我有个建议：
I know what, let's do it now.
我有个主意, 我们现在就干吧。
know best
- have better knowledge or more appropriate skills更知道, 更懂得。
know better than
- be wise or polite enough to avoid doing a particular thing知道不该, 明白事理（而不去做某事）：
you ought to know better than to ask that.
你应该知道这种事不能问。
know someone by sight
- recognize someone by their appearance without knowing their name or being so well acquainted as to talk to them与某人只是面熟。
know different（或otherwise）
- be aware of information or evidence to the contrary知道相反的消息（或证据）。
know something for a fact
- be aware of something that is irrefutable or beyond doubt确切知道：
I know for a fact that he can't speak a word of Japanese.
我确切知道他一句日语也不会说。
know someone in the biblical sense
- informal, humorous have sexual intercourse with someone〈非正式, 幽默〉与某人性交。
know no bounds
- have no limits无限, 没有边际：
their courage knows no bounds.
他们有无限的勇气。
know one's own mind
- be decisive and certain有决断。
know one's way around
- be familiar with (an area, procedure, or subject)熟悉（地区, 领域, 程序或主题）。
know the ropes
- have experience of the appropriate procedures懂得诀窍, 在行。
- ORIGIN: with reference to ropes used in sailing
know what's what
- informal be experienced and competent in a particular area〈非正式〉（在…方面）是内行, 懂行。
know who's who
- be aware of the identity and status of each person知道各人的身份和地位。
let it be（或make something） known
- ensure that people are informed about something, especially via a third party（尤指经由第三方）保证大家都被通知到：
with clause the Minister let it be known that he was not seeking reappointment.部长通过他人之口表态说他不想连任。
not know from nothing
- N. Amer. informal be totally ignorant, either generally or concerning something in particular〈北美, 非正式〉（对总体或局部）完全不知：
she shakes her head while you talk, as if to say you don't know from nothing.
你讲话的时候她不停地摇头, 好像要说你完全无知。
not know the first thing about
- have not the slightest idea about (something)对（某事物）一无所知。
not know that
- informal used to express one's doubts about one's ability to do something〈非正式〉［用以表示对自己能力的怀疑］不知如何：
I don't know that I can sum up my meaning on paper.
我不知道我能否用书面形式总结出我的想法来。
not know what to do with oneself
- be at a loss as to know what to do, typically through boredom, embarrassment, or anxiety（常指因厌烦、困惑或焦虑而）不知如何是好。
not know where（或which way）to look
- feel great embarrassment and not know how to react尴尬, 不知所措。
not want to know
- informal refuse to react or take notice〈非正式〉不愿重视; 不感兴趣：
they just didn't want to know when I gave my side of the story.
我提出自己对事情经过的说法时, 他们连听都不愿意听。
what does - know?
- informal used to indicate that someone knows nothing about the subject in question〈非正式〉［表示某人对所谈话题一无所知］某人懂什么：
what does he know about football, anyway?
不管怎样, 他对足球懂什么？
what do you know (about that)?
- informal, chiefly N. Amer. used as an expression of surprise〈非正式, 主北美〉（表示吃惊）你看怪不怪, 真想不到。
wouldn't you like to know?
- informal used to express the speaker's firm intention not to reveal something in spite of a questioner's curiosity〈非正式〉［用于表示不透露某事的决心］你别想知道; 你就别问了：
'You're loaded, aren't you, Bella?' 'Wouldn't you like to know?'
“你很有钱, 是吗, 贝拉？”“就不告诉你！”
you know
- informal used to imply that what is being referred to is known to or understood by the listener〈非正式〉［表示所指之事已被听话者理解或知道］你知道, 你也清楚：
when in Rome, you know.
在罗马的时候, 你知道。
- used as a gap-filler in conversation［用作对话中的插入语］你知道：
oh well, you know, I was wondering if you had any jobs for me.
哦, 是的, 你知道, 我在想你能否给我提供某种工作。
you know something （或what）？
- informal used to indicate that one is going to say something interesting or surprising〈非正式〉［用以引出有趣或惊人的话语］你猜怎么着？你猜是怎么回事？：
you know what? I believed her.
你猜怎么着？我相信了她。
you never know
- informal you can never be certain; it's impossible to predict〈非正式〉很难说, 不可预知。