whetstone
whetstone
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whetstone
grindstone
砥礪 是 一 種 工具。
A whetstone is a type of tool.
他 用 砥礪 把 刀 磨利。
He used a whetstone to sharpen the knife.
這 塊 砥礪 已經 用 了 很多 年。
This whetstone has been used for many years.