differential astrometry

• 较差天体测量

differential astrometry的用法和样例：

例句

1. Astrometry has other advantages as well.
   天体测量也有其他优势。
2. A set of new theory and method of astrometry are being modified, we should catch up with development of this field.
   新的一套天体测量理论和方法正在变更之中，我们应及时跟上这个领域的发展步伐。