You're vouching for this person?

现在你在为这个人做担保？

Now you're... you're vouching for this person?

现在你在为这个人做担保？

These are references vouching for his ability.

这些都是证明他能力的介绍信。

Vouching for someone else's skill requires close observation or questioning by someone already possessing it.

为了证实一些人的技能，必须要由已经掌握了这些技能的人，进行密切观察或是提问。

The goal isn’t to put words into your former colleague’s mouth or to co-opt her into vouching for you in an untrue or disingenuous manner;

目的并不是说把语言放进你的前同事嘴里，或者在不真实，不大方的方式下指派她为你担保；