iron boot 负重鞋 例句与用法: The period in which man learnt to make tools of iron is called the Iron Age. 人类学会用铁制造工具的时代称为铁器时代。 词形变化: 动词过去式: ironed | 动词过去分词: ironed | 动词现在分词: ironing | 动词第三人称单数: irons |