zero object [数] 零对象
For an object to be in rotational equilibrium about a certain point, the total torque about this point must be zero.
一个物体若要在某一点处处于转动平衡，在这一点处的总力矩必须为零。
If the count becomes zero, the object is destroyed and the memory is returned to the heap.
如果计数为零，该对象就会被销毁，其占用的内存也会返回给堆。
For simple objects, Project Zero automatically converts the object into JSON using the public get functions.
对于简单对象，Project Zero会使用公有get函数自动将对象转换为JSON。
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