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《A summary of the history, construction and effects in warfare of the projectile-throwing engines of the ancients, with a treatise on the structure, power and management of Turkish and other Oriental bows of mediæval and later times》,Ralph, Sir Payne-Gallwey。这是一部关于历史、战争、科学的公版作品,适合在安静的片刻里慢慢读下去。
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