当垃圾收集器移动一个对象时，垃圾收集器会把所有的指向该对象的句柄更新为对象的新地址。
When the garbage collector moves an object the garbage collector also updates all handles that refer to the object with the object's new location.
当垃圾收集器移动一个对象时，垃圾收集器会把所有的指向该对象的句柄更新为对象的新地址。
When the garbage collector moves an object the garbage collector also updates all handles that refer to the object with the object's new location.
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