vouch
[vaʊtʃ]
vi.
保证;
担保;
确定;
确定地说;
vt.
（因亲眼看见而）为…作证;
断定;
传（某人）出庭作证;
n.
被担保者;
例句:
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He cannot vouch for the accuracy of the story.
他不能证明这一说法的准确性。
来自柯林斯例句
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Kim's mother agreed to vouch for Maria and get her a job.
金的母亲同意为玛丽亚担保，好让她找份工作。
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They asked whether I was prepared to vouch for him.
他们问我是否愿意为他作担保.
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He needs to find someone to vouch for him.
来自NEWYORKER
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For the truth of this I vouch the mathematicians.
来自W. Wollaston
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It would be too long to vouch Texts for each particular.
来自R. Sanderson