According to the practices used to grind the Emery paper No.1 is a more suitable, you can wear the new blade, and the grinding larger defects in the old blade.

• 根据践诺不纬验，用1号金刚砂纸磨刀是较不合的，既可以磨陈刀片，又可磨有较不小缺损的不陈刀片。