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1·It was Genghiz Khan's rule to spare cities which surrendered but pyramids of skulls bore mute witness to the Mongol ferocity where people resisted.

放过投降的城市是成吉思汗的原则，但是用头盖骨堆积起来的金字塔是人民抵抗蒙古人残暴行径的无声见证。

2·The stone axe, brought to light after untold ages, bears mute but expressive witness that its owner was a savage.

这把石斧经过岁月的沉淀已经变得非常轻盈，但是它却无声却有力地证明了一个事实—它的主人是一个野人。