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。

youdao

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。

youdao