The planets are bigger than Earth -- one is 4.2 times the mass, one is 6.7 times and the third is 9.4 times.

这些行星都要比偶们的地球大，她们的质量分别是地球的4.2，6.7，9.4倍。

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Earth is the third planet from the sun and funnily enough, the one we know the most about.

地球是从太阳和有趣的是第三颗行星，一个我们知道最关注。

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Footprint - the area in which a specific transmission can be received. Some footprints cover as much as one-third of the earth, such as satellite or cell systems.

覆盖面-某个卫星信号覆盖的区域。有些卫星信号覆盖面非常大，达整个地球的三分之一，例如卫星或手提电话系统等。

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In 2002 a mid-sized asteroid (50-120 metres across) missed Earth by 121, 000km one-third of the distance to the moon.

ECONOMIST: Green.view: The threat from outer space | The

But one- third of it could survive, including pieces as large as a small car, and smack into the Earth as fast as 0.6 mile (1 km) a second, authorities said.

CNN: Mir demise causes international high anxiety