improve on
词形变化：
动词过去式: improved | 动词过去分词: improved | 动词现在分词: improving | 动词第三人称单数: improves |
同义词：
better | perfect | enhance | ameliorate | progress | develop | mend | advance | rally | meliorate | refine | look up | amend | get better | perk up | pick up | build up | further | correct | adjust | touch up | tweak | titivate | cultivate | gain | help | enrich | promote | revise | recover | convalesce | appreciate | emend | strengthen | uplift | reform |
反义词：