vouching

He vouched his words by his deeds.

用自己行动明了自己言辞。

I can vouch for the fact that he is a good worker.

我保是好工。

They asked whether I was prepared to vouch for him.

们问我是否愿意为作担保。

You should give the names of two people who can vouch for your honesty and reliability.

你应该提供两个能担保你诚实可信字。