edge stone的用法和樣例：
例句
- He sharpened the edge of his knife on a grindstone.
他在磨石上磨快了他的刀刃。 - We suggest sharpening on a wet stone because it cleans the pores of the sharpener dissipates frictional heat and facilitates smooth sharpening action.
我們建議使用一塊弄濕了的磨石，因為研磨液體能幫助清潔磨具上的孔，能散去摩擦產(chǎn)生的熱量，還能使磨刀的動(dòng)作更加順滑。
