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.
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.
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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