实际上，pick your brain是指“我有问题想请教你，征求某人的意见，向某人学习”。

If you have some time later, I like to pick your brain about some legal issues.

你要是有时间，我想向你请教一些法律问题。

You sound very well traveled, so I'm hoping to pick your brain.

听起来你的旅行经验丰富，我正想多借鉴你的心得。

brain在口语中很常见，我们再来学习一些其他的表达：

1 rack one's brain

绞尽脑汁，冥思苦想

We'll have to rack our brain and think of some effective measures.

我们得绞尽脑汁想出一些行之有效的办法。

2 brain teaser

脑筋急转弯

The answer reminded me of a brain-teaser that's been entertaining me for the past couple of months.

这个回答让我想起了几个月来一直在思考的一个脑筋急转弯问题。

3 brain trust

专家顾问团，智囊团

The president faces conflicting advice from his brain trust.

总统面对着智囊团提出的相互冲突的意见。

4 bird brain

笨蛋；〈美俚〉轻浮无知的人

Don't ask that bird brain, he knew nothing.

别问那傻瓜，他什么也不懂。

（来源：沪江英语）