On April 22nd, people around the world would celebrate Earth Day in different ways.

4月22日，世界各地的人们将以不同方式庆祝地球日。

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Is there anything on earth which cannot be doubted except death, the only certainty in this world?

这个世界上除了死亡，这一最不可辩驳的事物之外，还有什么是不能被怀疑的？

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UFO sightings have been reported throughout recorded history and in various parts of the world, raising questions about life on other planets and whether extraterrestrials have visited Earth.

在全世界各地不同时期都有ufo目击的报告，引起人们关于外星生命以及地外生命是否访问过地球的争论。

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Because of Kahn,experts say, one of the poorest countries in the world has one of the most beautiful public buildings on Earth.

VOA: special.2009.12.13

"That's why we're coming together on the Mall and standing in solidarity with millions of people at thousands of Earth Day events around the world, " Rogers said in a statement on the Earth Day web site.

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What are his basic habits of mind that remain so pointedly relevant to the zeitgeist here on Earth, in the real world?

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The "Defiance" world is set in the year 2046 on a transformed Earth ravaged by conflict and alien attacks.

CNN: 'Defiance' merges TV, video-gaming worlds