当然其原因是我们的简单日期标记没有正文。

The reason, of course, is that our simple date tag has no body.

youdao

例如，如果标记没有正确地结束，则编辑器将显示一条错误，并停止视图切换。

For example, if a tag is not properly closed, the editor displays an error and stops the view switch.

youdao

这些标记没有可见的表示形式(除非添加边框，像我这样做)，但它们很好地标记了内容的放置位置。

These tags have no visible presence (unless you add borders and such, as I have), but they act as a good marker for where content should go.

youdao

They're not color-coded, so how you do you find them?

它们没有彩色标记,你怎么找到它们呢

耶鲁公开课 - 生物医学工程探索课程节选

It gives a sense of what this music is all--really all about and since, as we were saying, so much classical music doesn't have a text with it we've got to have some markers in there to know what the composer is trying to communicate to us.

让我们了解这段音乐想表达什么，就像我说的，大部分古典音乐并没有文字注解，而我们需要一些标记,来告诉我们作曲家想用这段音乐告诉我们什么。

耶鲁公开课 - 聆听音乐课程节选

Suppose that there were some sort of genetic marker and, although we didn't have a tattoo that you would just have to look at, -- but you could have genetic counseling-- have your DNA examined and you could tell, if you had the DNA testing, how much time you had left.

假设有某种基因标记，虽然我们没有,让你不得不去看的在身上的标记了，但你可能会去做基因咨询-,检查你的DNA，如果你做了DNA化验的话，你就能知道自己还剩多少时间。

耶鲁公开课 - 死亡课程节选