词The earliest muzzle-loading rifles were more difficult to load than smoothbore muskets, but the invention of metallic cartridges made possible the development of breech-loading mechanisms.
最早
前装步枪装弹比滑膛枪困难，但金属弹药筒
明促进了后膛装弹装置
。
The earliest muzzle-loading rifles were more difficult to load than smoothbore muskets, but the invention of metallic cartridges made possible the development of breech-loading mechanisms.
最早前装步枪装弹比滑膛枪困难，但金属弹药筒明促进了后膛装弹装置。
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