"Jack of all trades, master of none" is a figure of speech used in reference to a person that is competent with many skills but is not necessarily outstanding in any particular one.
双语例句
1
He is a jackofalltrades and master of none.
他样样都懂一点，但都不精通。
2
Answer: The Druid was designed as a "JackofAllTrades" type of character - good at many things yet master of none.
回答：因为德鲁伊是被设计成一个“万金油”型的角色——擅长很多东西却都不精通。
3
The probable result is that the child might be Jackofalltrades but master of none or, even worse, she might be unable to express herself in her mother tongue.