goldmine

n.金矿

This new invention will bring you great profits like a goldmine. 这项新发明会像一座金矿一样给你们带来利润。

If you come with a Rolodex packed with potential contacts, those connections could be a goldmine to an employer. 如果你带来了有潜在客户的关系网，那么，对雇主来说这些关系可能会是一座金矿。