This is because the Earth turns on its axis from the North to the South Pole.

这是因为地球绕地轴自北极到南极旋转。

The reason people had always believed that the sun went round the earth was that the earth turns on its own axis, he said.

他说，人们一直相信太阳绕地球转的原因是地球绕着自己的轴转。