unfasten

详细解释:vt. 解开, 放松

词型变化：

动词过去式:unfastened过去分词:unfastened现在分词:unfastening第三人称单数:unfastens

英语解释：

动词 unfasten:

cause to become undonebecome undone or untied

例句：

He unfastened the buckles and took off the coat.他解开扣子，把上衣脱掉。