An immutable copy of a component in a particular workspace or stream is called a baseline.
特定工作区或流中的某个组件的不可变副本称为基准。
StringBuilder; one is immutable and changes to it cause the creation of a new copy, the other allows for in-place modification.
一个是不可变的，当需要修改的时候它会创建一个新的副本，而另一个则允许直接在其上进行修改。
You should always use collections to create immutable lists rather than arrays. Although it is possible to copy arrays defensively, it leads to some undesirable side-effects.
您应该始终使用集合而不是数组来创建不可变列表，尽管防御性的数组复制也是可行的，但这会带来一些不希望见到的副作用。
The Rope class is designed to be immutable, meaning that mutator functions never modify the original Rope instance, but, rather, return a modified copy.
Rope类被设计成不可修改，这意味着mutator函数永远不会修改原来的Rope实例，而是返回一个修改后的副本。
If the value being assigned is an immutable value class, the method returns the object itself, instead of a copy of the class.
如果指派的值是不可变动的实值类别，则方法会传回物件本身，而不是类别的复本。
If the value being assigned is an immutable value class, the method returns the object itself, instead of a copy of the class.
如果指派的值是不可变动的实值类别，则方法会传回物件本身，而不是类别的复本。
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