然而，tuple是不可变的。

A tuple, however, is immutable.

youdao

该类的实例是不可变的。

The instances of this class are immutable.

youdao

也是不可变的，周期是97分钟。

Is the period to go around, which is 97 minutes.

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

The key thing about both of them is that they were immutable.

关于他们有一点很关键的,就是他们都是不可变的。

麻省理工公开课 - 计算机科学及编程导论课程节选

What has changed and what has remained essential?

有什么变了，又有什么还是不可缺少的？

普林斯顿公开课 - 人性课程节选