For mutable objects, the answer is not always so clear.
对于可修改对象来说，答案并不总是如此清楚。
Some design problems are easier to solve with mutable objects.
有一些设计问题还是使用易变对象比较容易解决。
Lists, specifically, are handy mutable objects that can conveniently even hold multiple values.
明确的讲，列表是一些便利的可变对象，他们甚至可以方便地保留多个值。
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