From a vantage point outside our home, a revealing perspective has shown us the planet for what it really is; a ball of living star dust, a four-and-one-billion year old miracle.
从地球以外的有利地位来看,地球是一个有生命的、虚无缥缈的球体,一个有着50亿年生命的奇迹。
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There are four units andone module task in each module.