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1. Dr.eye 譯典通片語

   know one's onions

   • ph.
     【口】了解本行; 精通業務
2. • 釋義
   • 同反義

   ph.

   片語

   • 1. 【口】了解本行; 精通業務 He is a mechanical engineer. He knows his onions. 他是一位機械工程師, 精通本行業務。 He's a good lecturer as he really knows his onions. 他是位好講師, 因為他確實精通業務。

   同義詞

   【口】了解本行; 精通業務

   • know one's stuff
   • , know one's business