回答

・take advantage of one's weakness
・have something on

「抓住弱點」可以用英語 take advantage of one's weakness 、 have something on表達。

I'm sure he takes advantage of director's weakness. That's why he got promoted.
（我確信他抓住經理的弱點，這就是他升職的原因）

In order to succeed in this plan, it is necessary to have something on him.
（為了讓這個計劃成功，我們需要抓住他的弱點。）

有幫助｜0