Language points1. discovery n. 发现, make a discovery 作出一项发现 discover vt. 发现; 发觉; 找到 discoverer n. 发现者2. call up =ring up 给…打电话 还有“使想起,使忆起 征召…入伍”的意思The old photo calls up memories of my childhood.When war breaks out, we shall be called up at once.He called me up to tell the good news . call f..