| 例句 |
An astronomer can determine the brightness of each star.天文学家可以确定每颗恒星的亮度。The astronomer did not believe that Phosphorus was visible only in the evening.那位天文学家以前不相信晨星只有晚上可见。The astronomer looked at the starry sky, trying to locate Centaur.这位天文学家看著满天星斗的天空，试著找到半人马星座。The astronomer measures mean time and meantime watches several instruments.天文学家测定平太阳时，同时对一些仪器进行观察。 |