natural river water surface curve
natural river water surface curve
天然河流水面曲线
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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。
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