Another Earth could be circling the star right next door to us.
有另一个地球或许正围绕着我们隔壁的恒星旋转。
Long, long ago, the Earth once had 10 SUNS circling it.
很久以前，地球曾经有10个太阳围绕她运转的。
A number of satellites are now circling the earth.
一些人造卫星现在正环绕地球飞行。
The third is Earth. Notice the moon circling Earth and its position.
第三圈是地球，注意一下月球的的位置。
The third is Earth. Notice the moon circling Earth and its position.
第三圈是地球，注意一下月球的的位置。
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