Improvements in technology might have us on the verge of far, far more exciting unveiling: a second earth.

最近的科技成就可能超出了我们的期待 更振奋人心的研究成果出现了：第二个地球！

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In this movie, though, the existence of a second Earth is a metaphor, artistic leverage to explore what it means to confront yourself and your past, warts and all.

在这部电影中，地球2的存在是一个隐喻。 它通过艺术手段不加掩盖地探索面对你自己和过去时的意义。

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The wisdom of the day was derived from Ptolemy, an astronomer of the second century, whose elaborate system of the sky put Earth at the center of all heavenly motions.

当时的智慧来自于二世纪的天文学家托勒密，他的复杂天空体系把地球置于所有天体运动的中心。

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Some cities and communities will hold Earth Day activities and celebrations for an entire week, not just on April twenty-second.

VOA: special.2010.04.21

The hard work of this grassroots effort resulted in the first Earth Day on April twenty-second, nineteen seventy.

VOA: special.2010.04.21

He discovered that galaxies are moving away from Earth at speeds between three hundred kilometers a second and one thousand eight hundred kilometers a second.

VOA: special.2009.04.29

The newfound world, dubbed Kepler-22b, is much bigger than our planet - but, even so, it's also the smallest world yet discovered outside our Solar System, and finding it does bode well for the eventual detection of a true twin, a planet that really is a second Earth.

BBC: Viewpoint: The obsession with a 'twin Earth'

It was my daughter Chloe's second day on Earth, and already the mom anxiety had kicked in over what looked like a bruise just above her forehead.

CNN: My toddler had plastic surgery

Scientists discover that for every second now passing in Earth time, three years pass outside the planet.

FORBES: Aliens, Global Warming, and the Intergalactic Arms Race