天文学家

例句：

1. 1. He is an astronomer who has made many discoveries inthe field of astronomy.
   他是一位在天文学领域取得了许多发现的天文学家。
2. 2. The astronomer predicted that acomet would be heading towards Earth.
   这位天文学家预测一颗彗星将朝地球方向移动。
3. 3. Astronomers use telescopes to observe the stars and planets.
   天文学家使用望远镜来观察星星和行星。