An astronomer can determine the brightness of each star.天文学家能够测定每颗恒星的亮度。A new star attracted the notice of the astronomer.新发现的一颗星引起了那位天文学家的注意.It is the only tangible object the astronomer can handle.这是天文学家能够掌握的唯一可接触的对象....
It is the only tangible object the astronomer can handle.这是天文学家能够掌握的唯一可接触的对象.FRAN ? OISE COMBES, an astronomer at the Paris Observatory, is a leading expert on galaxy dynamics.康布任职于法国的巴黎天文台, 她是研究星系动力学方面的顶尖天文学家.There was ...