vouching

He vouched his words by his deeds.

他用行动证明了言辞。

They asked whether I was prepared to vouch for him.

他们问我是否愿意他作担保。

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

我保证他是好。

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

应该提供两个能担保诚实可信人名字。