sharpen

vt.磨利，磨尖

shapeless, shapelessly, shapelessness, shapeliness, shapely, shaping, shard, share, share in, share index, share with, share-cropper, share-out, shareholder, shark, shark-skin, sharp, sharp-eyed, sharp-sighted, sharp-witted, sharpener, sharper (also `card-sharper), sharpish, sharply, sharpness, sharpshooter, shat, shatter, shattered, shattering, shatterproof, shave, shave off, shaven, shaver, shaving, shaving-brush, shaving-cream, shaving-foam, shaving-stick, shavings,