He tells me is a city boy, and this is his first time to live in a camp like this.
他说他是一个都市男孩,这是他第一次过这种野营生活。
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。