微软的主营业务是大众化技术。

They are in the business of democratizing technology.

youdao

公司的主营业务是进出口。

S Main business is import and export.

youdao

大陆区主营业务是：城市规划、景观设计。

Core business in the mainland: the city planning the view design.

youdao

Anyway, what is investment banking, which is the subject of this?

回归正题，什么事银行投资业务，它的主营业务是什么？

耶鲁公开课 - 金融市场课程节选