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.
最早的前装步
装弹比滑膛困难，但金属弹药筒的发明促进了后膛装弹装置的发展。
,(尤指)滑膛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.
最早的前装步装弹比滑膛困难，但金属弹药筒的发明促进了后膛装弹装置的发展。
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