不对称水系

asymmetric drainage的用法和样例：

例句

The difference is mainly in the tone not in the drainage pattern or landform.所不同的主要在色调，而不在于水系型式或地形。
Drainage was to the north and individual channels bifurcate in that direction.整个水系向北排水，各个河道朝该方向分叉。

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