我们的地球是围绕太阳按轨道运行的九大行星之一。太阳、行星及行星各自的卫星构成了太阳系。
Our planet Earth is one of nine planets which move round, or orbit, the Sun. The Sun, planets, and their moons form the solar system.
我们的地球是围绕太阳按轨道运行的九大行星之一。太阳、行星及行星各自的卫星构成了太阳系。
Our planet Earth is one of nine planets which move round, or orbit, the Sun. The Sun, planets, and their moons form the solar system.
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