“恒星”造句
天文学家能够测定每颗
恒星的亮度。
An astronomer can determine the brightness of each star.
这颗
恒星的表面温度估计在零下75摄氏度左右。
The star's surface temperature is reckoned to be minus 75 degrees Celsius.
这些
恒星一定是形成于100到150亿年前。
The stars must have formed 10 to 15 billion years ago.