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欧洲人磨刀/剑：一手拿刀，另一手用磨刀石，中国人把磨刀石固定一个台阶，用双手磨刀。）(Europeans sharpen knife/sword: one hand holding knife, while the other hand using sharpen stone. Chinese fix the sharpening stone one a stage, using both hands to sharpen knife.)
https://www.youtube.com/watch?v=XM8IQ90v_MQ |
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