Earth is the only planet known to support life.
地球是已知唯一支持生命的行星。
Scientists are searching for water on another planet.
科学家们正在寻找另一颗行星上的水。
Mars is often called the red planet due to its color.
由于颜色原因，火星常被称为红色行星。
Venus is the hottest planet in our solar system.
金星是我们太阳系中最热的行星。
Jupiter is the largest planet in the solar system.
木星是太阳系中最大的行星。
Saturn is famous for its beautiful planet rings.
土星因其美丽的行星环而闻名。
Mercury is the closest planet to the sun.
水星是离太阳最近的行星。
Uranus is a planet that rotates on its side.
天王星是一颗侧旋的行星。
Neptune is the farthest planet from the sun in our system.
海王星是我们系统中离太阳最远的行星。
Pluto was once considered the ninth planet.
冥王星曾被认为是第九颗行星。
planet formation 行星形成
planet orbit 行星轨道
planet exploration 行星探测
planet atmosphere 行星大气层
planet surface 行星表面
planetary system 行星系统
复数: planets;
