阿基米德晚年的时候，罗马军队入侵他的祖国，这位伟大的科学家把自己的才智乃至生命都献给了保卫和国的神圣事业．当侵略者入侵叙拉古城时，他设计了投石机打得放人抱头景市；他制造的铁爪式起重机，能把敌人的船只从水中抓起，翻转过来抛入大海．传说，他还做了一面巨大的凹? In his later years, when the Roman army invaded his native country, Archbishop, the great scientist dedicated his own intellect and even his life to the sacred cause of defending and the kingdom. When the aggressors invaded the city of Syracuse, he designed a trebuchet to hit the city of Baotou; the iron-claw cranes he made could grab enemy ships from the water and flip them over into the sea. Legend has it that he also made a huge concave?