jack-of-all-trades, master of none
US /ˌdʒæk əv ɔːl ˈtreɪdz ˌmæstər əv nʌn/
UK /ˌdʒæk əv ɔːl ˈtreɪdz ˌmæstər əv nʌn/
1.
万金油，样样通样样松, 什么都会一点，但什么都不精
a person who is good at many different things but is not an expert at any of them
:
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He's a real jack-of-all-trades, master of none; he can fix a leaky faucet, bake a cake, and even play the guitar, but he's not exceptional at any of them.
他真是个万金油，样样通样样松；他能修漏水的水龙头，烤蛋糕，甚至弹吉他，但没有一项是出类拔萃的。
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The company needs specialists, not a jack-of-all-trades, master of none.
公司需要的是专家，而不是万金油，样样通样样松的人。