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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.

最早步枪弹比滑膛枪困难,但金属弹药筒促进了展。

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The ACR "rifles" used smoothbore barrels to fire single or multiple flechette per round, rather than bullets, to provide long range, flat trajectory, and armor piercing abilities.

炮弹(抛射物)必须拥有稳定外形,比如带尾翼箭状物或球体,以此减小射时震动。

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3G, 401(K), a,

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