他从事商业。

He is engaged in commerce.

《新英汉大辞典》

彼得本来打算从事商业工作，但经过2010年在加拿大的一段不愉快的经历后，他放弃了这个计划。

Peter had intended to take a job in business, but abandoned that plan after the unpleasant experience in Canada in 2010.

youdao

十六年前，我开始从事商业摄影。

Sixteen years ago I was doing commercial photography.

youdao

They are involved in commerce, some of them, but mostly what they do is they serve the state.

他们有的从事商业,但他们是大多是为国家效力的

耶鲁公开课 - 欧洲文明课程节选

In the future? Um... I want to go into trading which is,

以后吗？嗯……我想从事商业。

都是天才 - SpeakingMax英语口语达人

We have freshmen in the class, we have graduate students in the class, we have people from business backgrounds, art backgrounds, psychology, science, just about everything.

我们的课堂上有新生,有研究生,还有从事商业的,从事艺术,心理学,理学等方向的人

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选