国家地理 《战争机器:机枪 Megastructures:Machine Guns》英语中字 1080P 高清 枪械纪录片
4战争机器:机枪 Megastructures:Machine Guns Initially designed to save lives, the modern machine gun can destroy the enemy from more than a mile away and can fire 1,200 rounds in just 17 seconds. How did the ...
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