If a pointer pointing to an object not in the graph, then the object is not a reachable object, and then garbage collector sets the slot to null in the short weak reference table.
如果一个指针指向一个不在图中的对象，那么此对象就是一个不可到达的对象，垃圾收集器就将短弱引用表相应的槽置空。
The weak reference from the long-lived object to the short-lived object is kept long after the short-lived object has been destroyed.
在短周期对象销毁后，长周期对象对短周期对象的弱引用依然会长久保留下来。
Short pier shear wall made the weak links and the concept of seismic design, structural design for reference.
提出了短肢剪力墙抗震薄弱环节及概念设计，供结构设计职员参考。'）；
Short pier shear wall made the weak links and the concept of seismic design, structural design for reference.
提出了短肢剪力墙抗震薄弱环节及概念设计，供结构设计职员参考。'）；
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