The opacity-zero object can then handle all the input event processing for an underlying area.

然后，不透明度为零的物件便可处理基础区域的所有输入事件处理。

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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。

youdao

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。

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