(3) keep the blade-like sharpness: blade sharpness depends largely on the angle of the blade tearover hydrogenion of simplehearted degrees, and the quality of the sword.

• (3)保留刮刀的尖锐度：刮刀的尖锐度次给取决于刀刃的磨损角度和溶液的肮脏度以及刀的质度。