Applications should be addressed to: The business affairs editor.

申请信应该寄给商务编辑。

In his business affairs he has no morals.

他做生意不讲道德。

Exercise caution in your business affairs.

在营商的方方面面要保持谨慎。

You'd better sort out the business affairs before going.

你走之前最好把生意上的事务了结一下。

What to do? What is the core of business affairs?

做什么？商务的核心是什么？