Rather than wait for the other thread to finish, the current thread can "help" it out by finishing the operation for it by moving the tail pointer forward (b).
不必等候其他线程完成，当前线程就可以“帮助”它完成操作，把尾指针向前移动(B)。
Cut the thread leaving a small tail.
留一小段的线，然后剪断。
Cut the thread leaving a small tail.
留一小段的线，然后剪断。
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