Medium machine gun:
A medium machine gun (MMG), in modern terms, usually refers to a belt-fed automatic firearm firing a full-power rifle cartridge.
en.wikipedia.org
中型機槍:
中型機槍（medium machine gun，簡稱MMG）是一個近代槍械用語，泛指發射全威力彈藥（例如7.62×51 NATO及7.62×54R）、彈鏈供彈、具全自動火力的機槍。
zh.wikipedia.org
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Medium machine gun中型機槍