The boy is playing with a knife with a sharp edge.

这孩子正在玩一把锋利的刀。

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Explain the value of a really sharp point and edge, the latter, particularly with a double edged knife, being as much to prevent the knife from being seized as for slashing.

解释真正锋利的刀尖和刀刃的价值，后者，尤其对于双刃匕首来说，可以用削划在很大程度上防止对手抓刀。

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