如果您移动专案，连结将会中断，因为连结是相对的。
If you move your project, the link will be broken, because the link is relative.
如果您移动的同时，您的想法仍是重的选择，您将停滞不前。
If you move while your mind is still weighing options, you will flounder.
这是必需的，因为散列值是对象的地址，并且如果您移动该对象，则需要维护它。
This is required, because the hash value is the address of the object and you need to maintain this if you move the object.
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