I am not a sharpening stone effect, can make kitchen knives sharp, although its own cut what. — Horace.

我不如起个磨刀石的作用，能使钢刀锋利，虽然它自己切不动什么。——贺拉斯。

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He chose one large stone and began to hit one of the scrapers hard on the edge that needed sharpening.

他选了一个大块石头，在一个需要磨利的石刮子边沿上敲打起来。

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