This differs from the assignment of reference type variables, which copies a reference to the object but not the object itself.
这与引用类型变量的赋值不同，引用类型变量的赋值只复制对对象的引用，而不复制对象本身。
This differs from the assignment of reference type variables, which copies a reference to the object but not the object itself.
这与引用类型变量的赋值不同，引用类型变量的赋值只复制对对象的引用，而不复制对象本身。
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