The US Army uses two distinct families of weapons in 5.56 x 45 mm calibre: the M16 rifle and the derivative M4 carbine form one group, the M249 Squad Automatic Weapon the other.
美国陆军使用两种截然不同的5.56毫米口径木仓族：一种是M16步木仓以及其派生出来的M4卡宾木仓，另一种是M249班用机木仓。
Understanding the potential for catastrophe, Staff Sgt. Miller boldly charged the enemy and accurately engaged the entire force with his squad automatic weapon, thus eliminating the threat.
充分了解大难即将临头，在此千钧一发之际，米勒上士挺身而出，勇敢地冲向游击队，以他的班用机枪的全部火力，准确地压制住了游击队的火力。
Understanding the potential for catastrophe, Staff Sgt. Miller boldly charged the enemy and accurately engaged the entire force with his squad automatic weapon, thus eliminating the threat.
充分了解大难即将临头，在此千钧一发之际，米勒上士挺身而出，勇敢地冲向游击队，以他的班用机枪的全部火力，准确地压制住了游击队的火力。
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