Submachine gun:
A submachine gun (SMG) is an air-cooled, magazine-fed, automatic carbine designed to fire pistol cartridges.
en.wikipedia.org
冲锋枪:
冲锋枪（Submachine gun，縮寫SMG），又稱短機關銃、短機關槍、機關短槍或機關短銃，旧译手提机枪或手提轻机枪，一般泛指轻型的连发枪械，冲锋枪的设计者对这种武器的共同设计诉求為「轻便」及「全自动射击」。
zh.wikipedia.org
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Submachine gun冲锋枪