He reported to a section chief, who reported to a division chief, and so on up the line.

他受科长领导，科长受处长领导，如此逐级向上。

You are a section chief, don't ask me.

你好歹是个部门经理。不要来问我怎么办。

He resigned his post of section chief.

他辞了科长的职务。

The section chief vetoed this proposal.

科长否决了这个提案。

Let me introduce you to Mr Liu, our section chief.

让我给您介绍我们的科长，刘先生。