每当利用new分配一个对象时，您就得问自己，谁将删除该对象？何时删除？

Whenever you allocated an object with new, you had to ask yourself, who will delete this object and when?

youdao

引用计数(reference counting)是对一个给定的对象当前有多少指向它的引用保留有一个计数，然后当最后一个引用被释放时自动删除该对象。

Reference counting involves keeping a count of how many references to a given object are extant, then deleting the object automatically after the last one is released.

youdao

您在子工作区中所删除的对象，只能在不能得到的该工作区中(就是说，删除了)标记；但是，对象仍然存在于它的上级工作区中。

Objects that you delete in the child Workspace are only flagged in that Workspace as not being available (that is, deleted); however, the object still exists in its parent Workspace.

youdao