Land covers only one third of the earth.

陆地只占地球表面积的三分之一。

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LI: Don't you know the land is just one third of the earth?

李：你难道没听过地球上陆地面积只占三分之一吗？

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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