搖錢樹 angolul

gold mine▼(very profitable economic venture)
noun
[UK: ɡəʊld maɪn] [US: ɡoʊld ˈmaɪn]

golden goose▼(something that generates much profit)
noun
[UK: ˈɡəʊl.dən ɡuːs] [US: ˈɡoʊl.dən ˈɡuːs]