To avoid dangling Pointers (the dangerous situation where a block of memory is freed but a pointer still references it), you must delete the object only after the last reference is released.
为了避免悬空指针(一种危险的情况，即一块内存已经被释放了，而一个指针还在引用它)，必须在最后的引用释放之后才删除对象。
It is not coherent if it has faulty parallel constructions, pronouns with ambiguous reference, dangling or misplaced modifiers, confusing shifts in person and number, or in voice, tense, and mood.
如果有错误的并列结构，指代不明，修饰悬挂或错位，人和数字变动、语态、时态、语气混乱，这就是不连贯句。
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