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BNC: 37127 COCA: 30886
grindstone
grndstoʊn ˈgraɪndˌstoʊn
Word forms: plural grindstones
N-COUNT 磨石;砂轮 A grindstone is a large round stone that turns like a wheel and is used for sharpening knives and tools. 磨石;砂轮
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