墨子号质量在600千克以上，进入距地面高度500公里的太阳同步轨道后，每90分钟环绕地球一圈。
The 600-plus-kilogram satellite will circle the Earth once every 90 minutes after it enters a sun-synchronous orbit at an altitude of 500 kilometers.
Kalkar核电站遭遇的复杂情况源于其有80个足球场那么大，装电线多到可以环绕地球一圈，甚至两圈。
The Kalkar complex sprawled over an area the size of 80 soccer fields and had enough wiring to circle the globe… twice.
我们发现月球环绕地球的轨道总是圆周形--或很近似圆周形。 每一个月，或者更确切些说是每27又1/3天就环绕地球转一圈。
We find that it is traveling in a circle - or very nearly a circle - round the earth, going completely round once a month, or, more exactly, once very 27 1/3 days.
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