It will let us eliminate the risk we would take of contaminating the samples if they were brought back to Earth.
如果他们被带回地球，会使我们消除可能为样品污染而承担的风险。
In fact, if you take the longest possible perspective -now looking back about four billion years -you will find that every life form on earth is related to every other.
实际上，如果你从长远的角度来看的话——回顾到四十亿年前，你就会发现地球上的所有生物都是息息相关的。
In fact, if you take the longest possible perspective - now looking back about four billion years - you will find that every life form on earth is related to every other.
实际上，如果你从长远的角度来看的话——回顾到四十亿年前，你就会发现地球上的所有生物都是息息相关的。
Laid back: Ham appeared just as relaxed while preparing for take-off (left) as he did having come back down to earth.
相当悠闲：汉姆在火箭准备起飞的时候非常轻松(左图)，而返回地球时也一样轻松(右图)。
They collected some rock samples to take back to Earth for further research.
他们搜集了所有的岩石样本，带回地球作进一步的研究。
They collected many rock samples to take back to Earth for further research.
他们收集许多岩石样本带回地球作进一步的研究。
They collected many rock samples to take back to Earth for further research.
他们采集了许多岩石标本，带回地球作进一步研究。
Now that they are no longer ignorant of the causes of the sickness of our planet, they seek ways to help the Earth, to give back what they take away.
由于不再无视地球罹难的根源，人们正在寻求各种方法来治疗它，把自己取走的东西归还给地球。
So I angrily walked over, the little girl cried out, angry and said: "you should take good care of the grass, should not to step on it, back to the earth mother a 'clean' white face! ""
于是，我愤怒地走过去，把小女孩叫出来，生气地对她说： “你应该爱护小草，不应该去踩它，还给大地妈妈一张‘洁白干净’的脸吧！”
They collected Moon rocks to take back to the Earth for further research.
他们采集了月球岩石带回地球作进一步研究。
They collected more than thirty kilograms of rock and soil to take back to Earth.
他们收集了超过30公斤的岩石和土壤带回地球。
They collected more than thirty kilograms of rock and soil to take back to Earth.
他们收集了超过30公斤的岩石和土壤带回地球。
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