在这个被删除句柄范围中句柄引用的对象如果没有其他的引用的话，将在下一次的垃圾收集中被移除。
Objects referred to by handles within the deleted handle scope are eligible for removal in the next garbage collection if there are no other references to them.
当从工作内存中移除对象之后，引用该对象的（属于任何规则的）任何条件元素将不被求值。
When an object is removed from the working memory, any conditional elements (of any rule) that had a reference to this object cannot be evaluated now.
将已经损坏的对以前键值的引用移除。
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