backward flow 逆流 ; 回流 ; 反向流程 ; 对流
power flow backward 功率倒灌
saltwater and sediment flow backward 水沙倒灌
backward flow theory 后向血流学说
backward flow process [机] 反流法
backward flow problem 反向流问题
backward-facing step flow 后台阶流动
backward-flow 后向流
Backward, flow backward, o tide of the years!
噢，岁月的潮汐，后退，向后退！ ！
As the refrigerant does not flow backward before it flows into a compression space, it is possible to improve the compression efficiency.
由于在制冷剂流入压缩空间前制冷剂不会回流，所以能够提高压缩效率。
Valve regurgitation is a condition in which valves don't close tightly, allowing blood to flow backward across the valve. Symptoms include shortness of breath, fatigue and heart palpitations.
瓣膜回流是由于瓣膜关闭不全，致使血液通过瓣膜回流，症状包括呼吸短促、疲劳和心悸。
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