beat one's brains out絞盡腦汁。這個習語可不是在講要打爆某人的頭，而是形容一個人費盡心思去思考，用力到腦子都快擠出來了，也就是絞盡腦汁的意思。另外，想描述自己「太用力思考，以至於腦袋累了"，可以說My brain is fried.
看看老外聊天時怎麼用beat one's brains out：
Eva: Why have you been walking up and down the entire morning?
Nick: I am beating my brains out trying to memorize the VIP list Eva: You have to remember all the details about them, don't you?
Nick: Yeah. Tomorrow night is the VIP banquet, and I'm in charge of it.
Eva: Wow! Would you like to have a cup of coffee first?
伊娃：你為什麼整個早上都在走來走去？
尼克：我正在絞盡腦汁去背這份貴賓名單。
伊：你必須記得貴賓的所有信息，對吧？
尼克：是啊，明晚是招待貴賓的宴會，我是負責人。
伊娃：哇！那你要不要先來杯咖啡？
beat one's brains out例句精選：
It was too hard for him and he beat his brains out trying to get the answer.
這個問題對他來說大深奧了，他絞盡腦汁想找出答案。
I beat my brains out to rescue him.
為了救他，我傷透了腦筋。
I know we'd have to beat our brains out to get it done in reasonable time.
我知道我們必須絞盡腦汁以便在合理的時間內完成這件工作。
I beat my brains out trying to think of a way of getting round the difficulty.
我絞盡腦汁，試圖想出避開那一困難的辦法。
拓展學習：
diligent 影費盡心血的
industrious 影勤奮的；勤勞的
ponder 仔細考慮
rack one's brain 某人絞盡腦汁
an uphill task 艱巨的工作
on the go 活躍；忙碌