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gold mine

noun
🔊/ˈɡəʊld maɪn/
🔊/ˈɡəʊld maɪn/
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  1. a place where gold is dug out of the ground金矿
  2. a business or an activity that makes a large profit财源；宝库
    • This restaurant is a potential gold mine.这家餐馆很可能是棵摇钱树。🔊🔊