Each ActivatedRoute in the RouterState provides methods to traverse up and down the route tree to get information we may need from parent, child and sibling routes.

路由器状态为我们提供了从任意激活路由开始向上或向下遍历路由树的一种方式，以获得关于父、子、兄弟路由的信息。

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Each ActivatedRoute in the RouterState provides methods to traverse up and down the route tree to get information from parent, child and sibling routes.

路由器状态为我们提供了从任意激活路由开始向上或向下遍历路由树的一种方式，以获得关于父、子、兄弟路由的信息。

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A method of route surveys from traverse stations, without need of center line, is put forward. It demontrates high efficency in practice.

提出一种在导线点上直接放样路线边桩，而无需放样路线中桩的方法，它在生产实践中有很好的效果。

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