首先，污水经过一个过滤装置，取出大的物质例如树枝、垃圾和树叶。

First, it passes through a filter to remove large materials like tree limbs, trash and leaves.

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地图图形往往具有一定程度的空间结构特征，例如树枝状水系、棋盘状街道网等。

There are many structural units on maps, such as dendriform drainage and orthogonal streets.

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例如，树枝一处断裂不会导致整棵树的倒地，同样，脚踝扭伤不会废掉整条腿。

For instance, a crack in the branch of a tree will not lead to the felling of the tree in the same way that a broken ankle will not lead to collapse of the whole leg.

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