improver

名词复数：improvers

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：

correction | development | recovery | refinement | advance | amendment | step-up | upgrade | enhancement | culture | advancement | progress | expansion | headway | promotion | recuperation | enrichment | upturn | convalescence | melioration | betterment |

反义词：

deterioration | decline |