blow.back
n.（名词）The backpressure in an internal-combustion engine or a boiler.后压力：内燃机或锅炉中向后的压力Powder residue that is released upon automatic ejection of a spent cartridge or shell from a firearm.后焰：火器射击时，残留弹壳的自动弹射所释放的残余粉末The effect caused by recirculation into the source country of disinformation previously planted abroad by that country`s intelligence service in an effort to mislead the government of another country.情报回传：由一国的谍报组织为误导他国政府而在国外散布的假情报，意想不到地又传回本国的现象
