frequency drag
... frequency division step 分频级 frequency drag 频率拖曳 frequency drift 频率漂移 ...
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说明植物坝可以减小泥沙的起动拖曳力，降低上游泥沙的起动频率，并能使运动的泥沙在坝上游沉积下来。
These show that vegetation dam can reduce starting drag force and starting frequency of sediment in upper reaches. And can make athletic sediment deposit.
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