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）
