论文部分内容阅读
爸爸给我买了把小宝剑,可威风了,不过它很快就生锈了。可是博物馆里的千年宝剑却不会生锈,这是为什么呢?
Dad bought me a small sword, imposing, but it quickly rust. But the Millennium sword in the museum will not rust, which is why?