Solar storms aimed at Earth come in three stages, not all of which occur in any given storm.

扑向地球的太阳风暴分三个阶段，但并不是所有的阶段都发生在特定的风暴中。

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In order to spin off the Moon, Earth would have had to rotate so fast that a day would have lasted less than three hours.

为了脱离月球，地球必须旋转得如此之快，以至于一天持续的时间少于三个小时。

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We were discussing the geological evidence of liquid water on Earth and Mars three to four billion years ago.

我们讨论了30到40亿年前地球和火星上液态水存在的地质证据。

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The Earth takes twenty-four hours to complete one full turn or revolution of three-hundred-sixty degrees.

VOA: special.2010.07.14

He would circle the Earth three times during a five-hour Mercury flight.

VOA: special.2009.06.17

A taikonaut orbited Earth on a Chinese-built rocket in two thousand three.

VOA: special.2011.07.18

The planet, called HD209458b, passes in front of the Earth every three-and-a-half days, making accurate measurements possible over time.

ECONOMIST: Is there anybody out there?

Some said the earth-imaging orbiter, launched three years ago, wanted to emigrate, just as many Egyptians do.

ECONOMIST: The authorities want to control the airwaves��if they can

It recommended using geometric lines of latitude and longitude to convey a three-dimensional Earth on a two-dimensional surface, and it included the co-ordinates of over 8, 000 locations in the ancient world.

ECONOMIST: There is no such thing as an objective map