have (got) something on the brain

(informal)be obsessed with something

(非正式)縈繞于腦際，念念不忘

John has cars on the brain.

約翰心里老是惦記著汽車。

beat (one's) brains (out)

&I{Informal} To exert or expend great mental effort

【非正式用語】 絞盡腦汁，大費(fèi)腦筋：用光或耗盡極大的智力努力

She beat her brains out during the examination.

在考試中她絞盡腦汁

on the brain

Obsessively in mind

熱衷于，念念不忘：一心想著某事

The coach has winning on the brain.

教練一心想著取得勝利

pick (someone's) brain 或 pick (someone's) brains

To explore another's ideas through questioning.

思想剽竊：在解決問題中使用別人的想法

rack (one's) brain【非正式用語】

To think long and hard

冥思苦想：長時(shí)間艱苦地思考

I racked my brain for hours trying to recall her name.

幾小時(shí)來我苦苦思索以期回想起她的名字