know one's stuff

know one's stuff[nəʊ wʌnz stʌf] 

know one's stuff 基本解释
精通自己的业务;有两下子;
know one's stuff 双语例句

1. I don't usually go in for second-hand stuff, as you know, but this one's an exception: she's not like all the rest-she's a real houri!
    你知道我不大爱过门的女人,但这是例外,她不是人,她是会迷人的妖精!

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2. Language Points *know one's stuff/onions be good at doing sth.
    露一手吧!你是我们中间唯一能讲德语的人。

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