sharpening
词形变化：
名词: sharpener | 动词过去式: sharpened | 动词过去分词: sharpened | 动词现在分词: sharpening | 动词第三人称单数: sharpens |
同义词：
hone | grind | whet | file | taper | point | improve | perfect | tip | brush up | strop | refine | polish | edge | inspire | keen | on | put | make | an | heighten | focus | focalise | focalize |
反义词：