我是在地球上空飞行，越飞越高。

I was flying above the Earth, rising higher and higher.

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这是因为目标将处于地球上空约500公里处。

This is because the object will be about 500 kilometers above the Earth.

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根据最新一项研究报告表明，地球上空的大气臭氧层开始停止变薄。

The ozone layer in Earth's upper atmosphere has stopped thinning, concludes a new report.

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