back flow
逆流：指流体以相反方向流动的现象。
常用释义
英式发音
美式发音
基本释义
- 逆流：指流体以相反方向流动的现象。
例句
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1·Capacitance vessels constrict, increasing the back flow of venous blood.容量血管收缩，静脉回流量增加。
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2·A flow control to install before back flow of the loop into the tank and to head the frequence control pump.流速控制必须安装在循环系统中储罐的回水之前以控制变频泵。
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3·The user installs a dual check back flow preventer at the water meter as prescribed by the supplier of safe drinking water.用户要由安全饮用水供应商在水表处安装法定的双止回防回流阀。
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4·The test results show that the apron can reduce back flow at the dam toe, and the piers can obviously diminish river bed scouring near the scour resistant wall.试验结果表明：护坦减轻了下游纵向围堰左侧坝趾处的回流淘刷，隔流墩明显减轻了防冲墙附近河床的冲刷，确保了坝基和下游纵向围堰的安全。
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5·In this paper, we present a new type of hybrid arc quenching system, which controls the metal vapor and back flow of the hot air in splitters arc quenching chamber.本文研究了一种将窄缝与栅片配合应用于限流断路器的新型混合式灭弧系统。控制了栅片间金属短弧的金属蒸气喷流，同时削弱灭弧室中热气体的回流。
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6·All Stenner metering pumps have a 3-point roller design in the pump head, which ACTS as a check valve to prevent back flow, siphoning, overdosing and loss of prime.泵头有3点滚筒设计，设备可作为止回阀阻止回流，虹吸，过量用药和避免大量的材料损失等。
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7·Using baicalin as the standard sample, the flavone substances in pollen of Yunnan pine were determined through methyl alcohol back flow extraction and ultraviolet spectrophotometer.以黄芩甙为标样，对云南松花粉中黄酮类化合物采用甲醇回流提取，用紫外分光光度法进行测定。
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8·This paper simulates the effect of crosswind on the thermal performance of wet cooling tower and puts forward a feasibility advice of fixing back flow canal around the tower to reduce the water loss.模拟了横向风对冷却塔热力特性和飘水损失的影响；提出了沿塔周设置回流槽的措施，以减少飘水损失。
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9·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。
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10·Mantle material can sink at a plate boundary, and then flow back upward farther away, pushing on the crust - a process called small scale convection.地幔，这种物质可以在板块边界处下沉，然后向上回流到较远的地方，再与地壳相碰撞——这个过程被称为小规模的对流。
网络释义
- backflow preventer : 回流防止器；防止回流设施