英语听力课堂(www.tingclass.net)是公益性质的英语学习网站，您可以在线学习英语听力和英语口语等,请帮助我们多多宣传，谢谢！
UK (US rack your brain)
rack /ræk/ v. 变形、折磨;榨取
to think very hard
绞尽脑汁，搜肠刮肚
I've been racking my brains all day but I can't remember her name.
我搜肠刮肚想了一整天，却怎么也记不起她的名字来。
Don't think this job a piece of cake. You'll have to rack your brains once you start on it.
别以为这工作是易如反掌的事，你做了就知道它是很伤脑筋的。