In expository prose, paragraphs can (and should) be neat and utilitarian.

写说时候，段落可以（并且应该是）简洁实用。

It's only a single sentence long, and expository paragraphs almost never consist of a single sentence.

这段话只由，陈述解释性段落几乎绝少只由子构成。

The ideal expository graf contains a topic sentence followed by others which explain or amplify the first.

理想说段落应该以概括性子起头，接下去子解释或者详述第内容。

This article is a piece of expository writing.

这篇章是篇说。