但在天然河道水面线计算中，为了节省工作量把不恒定流视为恒定流。
However, the unstable flow is usually considered as stable flow in the calculation of natural river water surface curve in order to minimize the calculation work.
但在天然河道水面线计算中，为了节省工作量把不恒定流视为恒定流。
However, the unstable flow is usually considered as stable flow in the calculation of natural river water surface curve in order to minimize the calculation work.
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