toughen
过去式:toughened
过去分词:toughened
现在进行时:toughening
词形变化:
名词: toughener | 动词过去式: toughened | 动词过去分词: toughened | 动词现在分词: toughening | 动词第三人称单数: toughens |
词义辨析:
同义参见: