在向明中学,叶大卫是一位不折不扣的“明星”,人长得帅、学习又好,还是校学生会主度,这样的“明星”在校园里没有几个人不认识。但让叶大卫更出名的则是他申请了五项专利,在这申请的五项专利中,最耀眼的则是自动追踪太阳轨迹的日晷。今天,就让我们走近叶大卫,听听他制作日晷的故事…… In Xiangming Middle School, David Ye was an out-and-out “star”. He was handsome and well-educated. He was still a student student. The “stars” were not known on campus. However, David was better known for his five patents. Among the five patents filed for this application, the most dazzling is the automatic tracking of the solar trajectory. Today, let’s get close to David Yeh and listen to his story of making a sundial...