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N-COUNT
见证人;目击者
A witness to an event such as an accident or crime is a person who saw it.
例句
Witnesses to the crash say they saw an explosion just before the disaster...
空难目击者称，就在灾难发生之前他们看见飞机发生了爆炸。
No witnesses have come forward.
没有目击证人站出来。
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VERB
目击;目睹
If you witness something, you see it happen.
例句
Anyone who witnessed the attack should call the police...
目睹这次袭击的人都应向警方报告。
It was the quickest swimming lesson I'd ever witnessed.
这是我所见过的最速成的游泳课。
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N-COUNT
(出庭的)证人
A witness is someone who appears in a court of law to say what they know about a crime or other event.
例句
In the next three or four days, eleven witnesses will be called to testify.
接下来的三四天里，将传唤11名证人出庭作证。
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N-COUNT
见证人;连署人
A witness is someone who writes their name on a document that you have signed, to confirm that it really is your signature.
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VERB
为(文件的签署)作证;连署
If someone witnesses your signature on a document, they write their name after it, to confirm that it really is your signature.
例句
Ask a friend to witness your signature.
请一位朋友给你的签名作证。
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VERB
见证，经历(事件、变化等)
If you say that a place, period of time, or person witnessed a particular event or change, you mean that it happened in that place, during that period of time, or while that person was alive.
例句
India has witnessed many political changes in recent years...
印度近年来经历了很多政治变动。
The year 1886 witnessed the first extended translation into English of the writings of Eliphas Levi...
1886年，埃利法斯·莱维的作品第一次有了长篇英译本。
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VERB
以…为证;…便是明证
You use witness to introduce an example of what you have just been talking about.
例句
Americans are a generous people: witness the increase in charitable giving, even during the recession.
美国人是个慷慨的民族：即使是在经济萧条时期，慈善捐赠也在不断增加，这便是明证。
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PHRASE
是…的见证人;是…的目击者
If you are witness to something, you see it happen.
例句
Too often children are witness to a disturbing amount of violence.
孩子们经常会目睹暴力事件,其数量之多令人不安。
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PHRASE
证明;为…作证
If a person or thing bears witness to something, they show or say that it exists or happened.
例句
Many of these poems bear witness to his years spent in India and China...
这些诗中有很多见证了他在印度和中国度过的岁月。
Many veterans believe it is their job to bear witness to the horrors of war that they personally experienced.
很多老兵认为他们有职责为他们亲身经历的战争的恐怖作证。