It was quite a lucrative sideline
这份兼职很赚钱。
It's a lucrative business.
这是一笔赚钱的生意。
It was a great experience and lucrative as well.
它是一巨大经验和赚钱的。
The target market is a lucrative one.
它的目标市场颇有利可图。
Your own small business on the side sounds pretty lucrative.
你兼营的自己的小企业会很有利润。