It can't hurt is used when your friend or whoever you re talking to is a little bit nervous or scared to do something. Then you want to show your friend that there won't be any negative consequences to doing this thing, so they just need to do it.

當(dāng)你的朋友或者你的談話對象有點緊張或者害怕做某事的時候，你就可以安慰他說It can't hurt。意思就是想讓你的朋友知道做這件事不會有任何負面后果，他們只需要去做就行了。

I doubt that he knows where it is, but it can't hurt to ask.

我懷疑他是否知道那東西在哪兒，不過問問也無妨。

A. Should I ask her for a job?

我應(yīng)該找她給我份工作嗎?

B. It can't hurt (to ask).

問問也無礙。