By David McAlary Washington 30 November 2006 An ancient piece of Greek technology recovered from a shipwreck more than 100 years ago is amazing scientists who have analyzed it in detail. Fragments of bronze gearwheels, now green and crumbling from m

发表于:2018-12-07 / 阅读(125) / 评论(0) 分类 2006年VOA标准英语(十一月)