Why does the earth always move round the sun and not fly off into cold space?
为什么地球总是围绕太阳转而不飞落到寒冷的大空？
Electrons move round the nucleus as the earth moves round the sun.
电子绕原子核运转就像地球绕太阳运行一样。
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。
Many people of that time were sure the earth never moved, and the other planets and the sun appeared to move round the earth.
当时，许多人确信地球从不运动，而其他行星和太阳似乎在围绕地球运动。
Many people of that time believed that the earth never moved, and the other planets and the sun appeared to move round the earth.
那时有许多人确认地球绝不运动，而其他行星和太阳似乎围绕地球运行。
Many people of that time believed that the earth never moved, and the other planets and the sun appeared to move round the earth.
那时有许多人确认地球绝不运动，而其他行星和太阳似乎围绕地球运行。
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