例如，我可以用带有更底层机制的单体(例如ThreadLocal)持有一堆统计值和上下文。

For example, I could have used a singleton with lower-level mechanisms like a ThreadLocal holding a stack of statistics and context.

youdao

可以给你讲一段个人的经历——想要斗赢我持有一股的某电力公司，又不致放水淹没弗吉尼亚山脉的某个溪谷——实操起来有多么艰难。

I can tell you from personal experience — trying to get an electric utility where I owned one share not to flood a valley in the Virginia mountains — exactly how hard it is.

youdao

就像tuple一样，list也可以持有不同类型的数据(或不同类型的对象)，这就是我所说的异构的可变序列。

And just like a tuple, a list can hold different types of data (or different types of objects). This is what I mean by a heterogeneous mutable sequence.

youdao