A jack-of-all-trades is someone who can do many different kinds of work. The sting, which English often leaves hanging in the air, is that they are not very skilled at any one of them. The old full line is “jack of all trades, master of none.” Jack here is the ordinary man; trades are kinds of work or craft, not the stock market.

A jack-of-all-trades is jack-of-all-trades指的是 someone who can do many different kinds of work 一個很多種工作都會做的人。The sting, which English often leaves hanging in the air 這個字帶刺的地方，英文常常不講白、留在空氣裡，is that they are not very skilled at any one of them 就是這個人沒有一樣特別精通。The old full line is "jack of all trades, master of none." 完整的老說法是「jack of all trades, master of none」——Jack here is the ordinary man Jack在這裡指的是普通人；trades are kinds of work or craft trades是各種工作或技藝，not the stock market 不是股票市場。

In real talk the feeling moves around. Sometimes it is fond: this is the neighbour who can fix a bike, paint a room, and cook, and you are glad they exist. Sometimes it is a polite way to say “spread thin” or “not an expert.” Younger, kinder speakers may push back and treat it as praise for being useful in many places.

In real talk the feeling moves around 實際講話時，這個字的語氣會變來變去。Sometimes it is fond 有時候是帶點喜愛的：this is the neighbour who can fix a bike, paint a room, and cook 就是那個會修腳踏車、會粉刷房間、會煮飯的鄰居，and you are glad they exist 而你很慶幸有這個人。Sometimes it is a polite way to say "spread thin" or "not an expert." 有時候是委婉地說「什麼都做一點、不是專家」——Younger, kinder speakers may push back 比較年輕、比較友善的人可能會反過來 and treat it as praise for being useful in many places 把它當成稱讚，讚美一個人到處都用得上。

You still need your ear: in a job interview it can sound like “no deep skill,” even if the speaker smiles. Informal. There is no single formal job title that matches it.

You still need your ear 你還是要用耳朵聽清楚語氣：in a job interview it can sound like "no deep skill," 在面試裡它聽起來可能是「沒有深入的專長」，even if the speaker smiles 就算說話的人臉上帶著笑。Informal 屬於口語、非正式。There is no single formal job title that matches it 沒有一個正式的職稱剛好對應這個字。