这方面没有什么特别不寻常的东西，但随后您会看到，GWT 将这些标识符用作放置元素的地方。

There's nothing particularly unusual about that, but as you'll see in a moment, GWT uses those identifiers as a place to put elements.

youdao

大部分的时间花费在WebKit计算如何放置元素，需要应用哪些样式，以及使用系统调用来绘制文本上了。

Most of the time is spent in WebKit computing where things will be placed, what styles to apply to them, and using system routines to draw text.

youdao

要支持重用，必须将这两个元素放置到它们各自的命名类型中。

To enable re-use, these two elements should be placed into their own named type.

youdao

So, for example, if I say TEST and I don't give it a start but I give it an end, then it gives me all the elements up to that point.

例如，我创建了TEST这个元组我没有给他,起始点却给了它一个结束点,然后程序会基于这一点放置所有的元素。

麻省理工公开课 - 计算机科学及编程导论课程节选