名词
中文翻译：回火枪
同义词：
['reciprocating blowback gun', 'reciprocating blowback action']
例句：
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1. The policeman blew backthe gun and shot the criminal.
警察用枪回击了罪犯。
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2. Theengineer designed a reciprocating blowback gun forthe firefighters.
工程师为消防员设计了一种往复式回火枪。
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3.The military used this type of gun intheir training exercises.
军队在训练中使用了这种类型的回火枪。