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？
When Sara gets on the No.7 bus, she finds that Flag Street stop has been closed because of the street repairs.
萨拉乘坐7号公交车时，发现旗街停靠站因道路维修而关闭。
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。
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