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。
Shippea Hill is a request stop, so passengers must flag down the driver if they want to board.
西皮亚山火车站是招呼站，因此如果旅客想在该站上车，须打旗号向司机示意。
Shippea Hill is a request stop, so passengers must flag down the driver if they want to board.
西皮亚山火车站是招呼站，因此如果旅客想在该站上车，须打旗号向司机示意。
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