象水一样不稳定,变化无常;
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。
She knew that she was as unstable as water and variable as the summer winds.
她知道自己象水一样起伏不稳,象夏风一样变幻无常.
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