英語短語：Know something inside out 對(duì)某事了如指掌

表達(dá) “know something inside out” 的意思是 “對(duì)某件事情、某個(gè)科目或主題了如指掌、洞悉透徹”。

例句
Don’t worry! You’ll be fine in tomorrow’s exam. You know the book inside out by now!
別擔(dān)心！明天的考試你一定會(huì)考好的。你現(xiàn)在對(duì)這本書已經(jīng)了如指掌了！

If you ever have any questions about the new IT system, ask Polly. She helped build it, so she knows it inside out.
如果你對(duì)新的信息技術(shù)系統(tǒng)有任何疑問，就去問波莉吧。這個(gè)系統(tǒng)是她幫忙建立的，所以她對(duì)整個(gè)系統(tǒng)了如指掌。

My grandad was a chess fanatic. You could ask him anything – he knew the game inside out.
我祖父曾是個(gè)國際象棋迷。你可以問他任何問題，他對(duì)這個(gè)游戲了如指掌。