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

写的时候，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.

这段话只由一，陈述解释性的段落几乎绝少只由一构成。

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

理想的段落应该以概括性起头，接下去的解释或者详述第一的内容。

This article is a piece of expository writing.

这篇章是一篇。