1. He is very interested in astronomy.
    他对天文学很感兴趣。

2. Predicting the coming of floods men made a calendar, and better calendars were made by observing the sun and the moon and the planets, and this led to the growth of astronomy.
    在预测洪水的过程中，人们编制了历法。通过对太阳、月亮和行星的观察，历法越编越好，天文学便应运而生。

3. Recent developments in astronomy have made it possible to detect planets in our won Milky Way and in other galaxies.
    天文学方面最新发展使得我们能够在银河系和其他星系发现行星。

4. In this way, we have learned all that we know of the laws of astronomy, or of the habits of the social insects, let us say.
    例如，用这种方法，我们完全掌握了天文学的规律和昆虫群居的习性。