The warriors carry long, ash spears tipped with hand-shaped flints as sharp as shards of broken glass, and blunt-headed stone clubs hanging from loops on broad oxhide belts.
这些勇士经过长途跋涉，把他们手中的长矛磨得和碎玻璃的尖一样锋利，宽大的牛皮围在腰间，上面悬挂着石锤。
A blunt knife may be sharpened on a stone, but if a man is stupid there is no help for his stupidity.
刀钝石上磨，人蠢没奈何。
If you try to cut stone with a knife, you will blunt the edge.
如果你试以刀砍石，你就会把刀刃弄钝。
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