清单11：表示元素类型的约束。

Listing 11: Expressing constraints on element types.

youdao

INT _ TEXT，表示元素的内容。

INT_TEXT, which represents contents of an element.

youdao

使用方框来表示元素。

Use boxes to represent elements.

youdao

In fact it gives me back, now I hate this, it's actually a list it's not a tuple. But for now think of it as giving you back an explicit version of that representation of all those elements.

它实际上是一个数组而不是一个元组，但是现在你们可以把它认为,是明确的这些,元素的一个表示,你会在接下来的一些课程中看到。

麻省理工公开课 - 计算机科学及编程导论课程节选

All right, this is actually kind of nice.

表示变长元素的方法了。

麻省理工公开课 - 计算机科学及编程导论课程节选

Let's choose Latin, the language of scholarship, and so iron became Fe for ferrum and lead became Pb for plumbum and gold is Au for aurum and so on.

那就选拉丁文吧，用于学术的语言，所以，iron就变成了Fe，表示铁元素,铅变成了，Pb，表示铅元素,金变成了Au，表示金元素，等等。

麻省理工公开课 - 固态化学导论课程节选