动词短语
中文翻译：作为
同义词：
['be a witness to', 'be a witness of', 'testify for']
例句：
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1. The defendant was found guilty and must now provide a witness for the prosecution.
被告被判有罪，现在必须为检方作证。
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2. The witness testified that she saw the suspect commit the crime.
目击者作证称她看见嫌疑人犯下了罪行。
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3. The witness's testimony played a crucial role in the trial.
证人的证词在审判中起到了关键作用。