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。
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。
And we know we cannot stop here. While we celebrate the seventh year of the Golden Flag Award, we must continue to work hard, and I need YOUR help.
我知道我们不能就此停下脚步。今天我们在这里庆祝第七届金旗奖颁奖典礼，我们还必须更加努力，继续前行，我需要你们的帮助和支持。
Lesson 5: When driving on the highway or, especially, on remote roads, do not stop for strangers who try to flag you down.
第五课 :当你开着车走在公路上，特别是郊外的公路上的时候，不要因为那些陌生朝你挥手你就停下来。
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。
Stop the rewriting process here and don't apply any more rewriting rules. Use this flag to prevent the currently rewritten URI from being rewritten further by following rules.
在此处停止重写过程并不再应用任何重写规则。使用此标志以防止当前重写的URI被后续规则再次重写。
Coal suddenly rocketed this railroad flag stop into industrial importance.
煤炭使这个铁路小站急剧上升到工业的重要位置。
Coal suddenly rocketed this railroad flag stop into industrial importance.
煤炭使这个铁路小站急剧上升到工业的重要位置。
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