back flow roll 背辊 ; 小挤水辊
back-flow preventer 防回流装置
filtrate passive back flow 原尿回漏
back flow condenser 回龄凝器
back-flow 回流 ; 逆流
downhole back flow valve 井下回流阀
back flow stand 退纸架
If two flying insect populations took up residence in separate nearby valleys, chances are that individuals from each population would fly back and forth, continuing gene flow.
如果有两个飞行昆虫种群居住在相距不远的不同山谷中，那么任一种群中的个体都有可能来回飞行，从而使基因流动继续。
Blocking checkpoints occur if we don't process the things efficiently on secondary, and the problem in secondary will back-flow and impact primary (blocks primary).
如果我们不能有效处理次要服务器上的工作，那么次要服务器上的问题会反过来影响主要服务器(阻塞主要服务器)，于是就会出现阻塞检查点的情况。
Lack of engineering control to arrest accidental back-flow (Design).
防止意外回流缺乏工程控制(设计)。
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