gold mine

• 能带来巨大财富、利润或宝贵信息的来源；极其赚钱或高产的事物。

A source of great wealth, profit, or valuable information; something that is extremely profitable or productive.

1. Source of wealthB2informal

   A place or thing that provides a large amount of money or valuable resources.

   摇钱树

   • The old house turned out to be a gold mine of antiques.
   • His invention became a gold mine for the company.
   • The oil field was a literal gold mine for the investors.

2. Valuable source of informationB2informal

   A person, book, or resource that provides a lot of useful or interesting information.

   信息宝库

   • That encyclopedia is a gold mine of historical facts.
   • The retired professor was a gold mine of knowledge about local history.
   • The website is a gold mine for learning new recipes.