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。

youdao

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？

youdao

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。

youdao

Wigfall agreed. He told Anderson to lower his flag and the firing would stop.

VOA: special.2009.08.13

Protest marches over Belfast City Council's decision to stop flying the flag every day have taken place almost every Saturday since 3 December.

BBC: St George's market, Belfast, traders seek rent holiday

Tensions have been high since city council members there voted a month ago to stop flying the Union flag year-round, restricting it instead to certain days.

CNN: SHARE THIS

The violent outbreaks were prompted by a decision on Monday of last week by Belfast city councilors to stop flying the Union flag year-round, restricting it instead to certain days.

CNN: Policewoman targeted as Northern Ireland tensions rise