名词
中文翻译：自动步枪
同义词：
['automatic gun', 'automatic weapon']
例句：
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1.The soldier was killed in the line of duty.
士兵在执行任务时牺牲了。
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2.The policeman used his automatic rifle to shoot the criminals.
警察用他的自动步枪射击了罪犯。
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3. The soldiers were trained to use automatic rifles for self-defense.
士兵们被训练用来使用自动步枪进行自卫。