排版时，每个字符之间需要留出半en的间距。

In typesetting, leave a half ___en space between each character.

这辆老式马车是19世纪常见的交通工具。

This old-fashioned ___horse was a common means of transportation in the 19th century.

我在HN上看到一篇关于人工智能的有趣文章。

I read an interesting article about AI on ___HN.