随着坦克和飞机在第一次世界大战的战场上出现,迫使人们想出许多办法进行反坦克和防空。开始,人们首先想到的是加大枪的口径,从6.5～8毫米增加到12毫米以上,提高枪弹的威力。于是出现了各种反坦克枪、平射大口径机枪、高射机枪、高平两用大口径机枪等,如英国14毫米博爱式反坦克枪、苏联14.5毫米西蒙诺夫反坦克枪、德国13.2毫米1918式反坦克枪、美国12.7毫米 M2式勃朗宁机枪、苏12.7 As tanks and planes emerged on the battlefields of World War I, there were many ways of devising anti-tank and air defenses. At first, people first thought of increasing the caliber of guns from 6.5 to 8 mm to 12 mm or more, increasing the power of bullets. As a result, a variety of anti-tank guns, large-caliber machine guns, high-projectile guns and high-caliber large-caliber machine guns, such as the British 14 mm Braun anti-tank gun, the Soviet Union 14.5 mm Simonev anti-tank gun, Germany 13.2 mm 1918 Anti-tank gun, the United States 12.7 mm M2 Browning machine gun, Su 12.7