The planetarium staff also prepared talks for radio broadcast.天文馆的工作人员还要准备讲稿给电台广播.On his days off, he takes them to the Museum of Natural History or the Planetarium.休假的日子里，他就带他们去自然历史博物馆或是天文馆。The motions of the stars can ...
Plagues were for merly regarded as a visitation of God.瘟疫从前被认为是上帝的惩罚.Europe suffered many plagues in the Middle Ages.欧洲在中世纪屡屡遭受瘟疫.Plagues aside, many critics see xenotransplantation as a colossal waste of resources.除了疫病外...