Scientists want to bring a chunk of the red planet down to Earth on what's called a sample-return mission.
科学家们希望将这颗红色星球的一大块带回地球，进行所谓的取样返回任务。
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If and when we bring back a coffee-cup-size sample from Mars in 2018, it will also need Earth-bound scrutiny.
在2018年，我们是否以及何时从火星上取回一个咖啡杯大小的样本，这也将需要我们地球人的审议。
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We very absolutely shocked when we found that not only it's not similar, but unlike the Earth where every sample is essentially the same, here we're getting these enormous differences.