First, there are two kinds of dashes, called en dashes and em dashes.

首先，有两种破折号， 称为 en dashes 和 em dashes。

You don’t need to worry about this; both en dashes and em dashes do the same job.

您不必为此担心； en dashes 和 em dashes 都做同样的工作。

En dashes have a space on either side of the dash – like this. Em dashes join onto the words before and after—like this.

破折号的两边都有一个空格——就像这样。 Em 破折号连接到单词之前和之后——就像这样。