unfastening 词形变化： 动词过去式: unfastened | 动词过去分词: unfastened | 动词现在分词: unfastening | 动词第三人称单数: unfastens | 同义词： undo | unhook | untie | unlock | detach | open | loosen | disengage | unbutton | release | uncouple | unbolt | liberate | 反义词： fasten |
