return flow        
[das] 回流
reverse current, back current, backwash, back stream, return flow

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[der] ①回流。逆流 return flow, backwash, back stream
②流。逆流。回流。 back current, return current, reverse current
③再带走,再曳 re-entrainment

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[die] 流，回流
back stream, reflow, return flow, backlayering, backflow, reverse flow, backwash