1. Greetings to our friends in planet Earth! 问候我们行星地球上的朋友！
2. Planet Earth is the third planet from the sun. 地球行星是来自太阳的第三颗行星。
3. Nearly every planet—and some of the moons—has an atmosphere . 几乎每一个行星--以及部分卫星--都有一个大气层。
英英解释
n.
1. (astronomy) any of the nine large celestial bodies in the solar system that revolve around the sun a
2. a person who follows or serves another
3. any celestial body (other than comets or satellites) that revolves around a star
