案例还包含一组元数据，即关于案例本身的信息。

The case also contains a set of metadata or information about the case.

youdao

本项试验的成功，验证了三组元发动机概念的可行性。

The successful test verifies that the concept of the three component engine is feasible.

youdao

组元活度的获得是合金热力学性质研究的一个重要方面。

Getting activity of component is an important aspect of researching the thermodynamic characters of alloy.

youdao

And I responded to at least one email about this issue, someone quite correctly said tuple are immutable, how can I change one?

我在不止一封邮件里回复了这个问题,一些人很明智，知道元组不可变,但是疑问怎么能去改变他们，我的答案是？

麻省理工公开课 - 计算机科学及编程导论课程节选

My answer is, you can't change one but you can create a new one that is almost like the old one but different in a little bit.

既然你不能改变元组,你可以新建一个跟原来的元组,大体上一致但有细微差别的元组。

麻省理工公开课 - 计算机科学及编程导论课程节选

And the nice thing is that there's a shared behavior there. Just as I can have tuples as an ordered collection of things, strings behave as an ordered collection of things.

共享的行为，就像元组是有序的元素序列,字符串也是有序的元素序列,因此我可以对字符串做同样的操作,我可以把它们连结起来。

麻省理工公开课 - 计算机科学及编程导论课程节选