After adding the linkage to the list, the number of weak references cleared changes from a large number to none at all.
向列表中添加链接之后，被清除的弱引用的数量将从较大的数更改为完全没有。
After adding the linkage to the list, the number of weak references cleared changes from a large number to none at all.
向列表中添加链接之后，被清除的弱引用的数量将从较大的数更改为完全没有。
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