Since then we installed a backflow valve so it was less this time.
自从那时起，我们安装了一个逆流阀，所以这次少了很多。
In the overhaul pump and output pipe, the system of fluid backflow will not occur.
这样在检修泵及输出管道时，系统中的液体不会发生倒流。
In the overhaul pump and output pipe, the system of fluid backflow will not occur.
这样在检修泵及输出管道时，系统中的液体不会发生倒流。
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