一个类型的复杂性指示了你应该使用这三个策略里面的哪一个来初始化不可变类型。
The complexity of a type dictates which of three strategies you will use to initialize your immutable type.
这些类型是不可变的，就是说整数对象一旦创建，其值便不可更改。
These types are immutable, which means that when an integer object is created, its value cannot be changed.
如文中所述，tuple类型是不可变的异构容器。
As discussed, the tuple type is an immutable heterogeneous container.
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