The transmission of the earth wave is stable, hardly influenced by climate and its channel parameter does not change with time basically, it is Constant Parameter Channel.

地波传播受天气的影响较小，比较稳定，信道参数基本上不随时间的变化而变化，是恒参信道。

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If a 100-foot-wide asteroid hit Earth, the shock wave from its explosion in the atmosphere could flatten trees and kill every large animal for hundreds of square miles.

如果一个100英尺直径的小行星撞击地球，它在大气中爆炸产生的冲击波可以令数百平方英里内所有的树木倒伏，并杀死所有的大型动物。

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We hope to build four by Christmas, including a "wave wall" with earth-bagged sleeping pouches nestled along the troughs.

我们希望能在圣诞节前建成四座建筑，包括一座由像睡袋那样的泥土口袋在低处垒起的防波墙。

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The short wave signals bounce off the ionosphere that surrounds the Earth,back to the ground and then back to the ionosphere.

VOA: special.2010.12.08

It is prone to earth tremors, and the tidal wave was not its first.

ECONOMIST: When the sea turned on the land

They certainly seem to be on the crest of another wave though resolutely down-to-earth about their own celebrity.

BBC: Human League reveal Secrets

But the earth itself radiating energy outwards in the form of long-wave heat rays.

FORBES: A Call to Arms on Climate Change