Teach fish to swim:

教魚怎么去游泳 ×

班門弄斧 √

例句：

Come on. What you are doing is to teach fish to swim.

行了，你這是關(guān)公門前耍大刀。

Got your number:

拿到您的號碼 ×

知道你打的什么算盤 √

例句：

You can't fool me, I've got your number – you're never going to pay me back.

你騙不了我。我知道你打的什么算盤——你根本不打算還我錢。

Egghead:

雞蛋的頭 ×

書呆子 √

例句：

John is going to be an egghead; he should have a rest. 

約翰都快成書呆子了，他應(yīng)該多放松一下。

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