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。
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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