Cash cow
01
摇钱树, 下金蛋的鸡
a service or product that provides a business or company with a stable income
例子
His latest invention turned out to be a real cash cow.
他的最新发明原来是一个真正的摇钱树。
The company 's flagship product has become a cash cow, generating steady profits year after year.
该公司的旗舰产品已成为摇钱树，年复一年地产生稳定的利润。
