jack-of-all-trades, master of none
US /ˌdʒæk əv ɔːl ˈtreɪdz ˌmæstər əv nʌn/
UK /ˌdʒæk əv ɔːl ˈtreɪdz ˌmæstər əv nʌn/
1.
萬金油，樣樣通樣樣鬆, 什麼都會一點，但什麼都不精
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.
他真是個萬金油，樣樣通樣樣鬆；他能修漏水的水龍頭，烤蛋糕，甚至彈吉他，但沒有一項是出類拔萃的。
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The company needs specialists, not a jack-of-all-trades, master of none.
公司需要的是專家，而不是萬金油，樣樣通樣樣鬆的人。