She has to get off at another stop. Look at the schedule again, where should Sara get off the bus so that she can have a shorter walk to Flag Street?
她必须在另一站下车。再看一遍时间表,莎拉应该在哪里下车,才能可以走更短的路到旗街?
This allows the thread to stop waiting if no messages have arrived, and check a flag to see if we should keep waiting for messages.
这将允许线程在没有消息到达的情况下停止等待,查看标志,看看是否应该坚持等待消息。
The primary difference in tree-visitor is that the visit-node function returns several items: a new-node, a new-state, and a stop flag.
tree-visitor 中的主要差别在于,visit-node 函数返回多个项目:一个 new-node、一个 new-state 和一个 stop 标记。
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