[問題] 槍在月球上射擊
如果拿一把步槍在月球上射擊.
因為重力與地球的不同,射手一定會承受更大
的後座力.
那麼,往後倒甚至飛出去.
這樣一來,適合在那裡使用的槍不是都要重新
設計?
假使設計槍彈有效距離跟地球一樣的話.
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