火星上有生命吗？
Is there life on Mars? We do not know (4).
在火星上有生命吗？我们(4)还不知道。
Mars is the only other planet that once had water on its surface – which is why scientists are looking for signs of life there.
除地球以外，火星是唯一的另一个存在表层水的行星。为此，科学家正在那里寻找生命的迹象。
For example, scientists have found evidence that there could be liquid water-which is necessary for life on earth-at many places on the Mars.
他说，比如，科学家曾经在火星上的很多地方发现曾有液态水存在的证据，而这是生物生存的必要条件。
Scientists assume there is no animal life on Mars.
科学家们假定火星上没有生命存在。
"We think that if there is life on Mars, it could be related to us," Massachusetts Institute of Technology engineer and scientist Christopher Carr told Discovery News.
“我们认为，如果火星上有生命存在，它可能跟我们是相关联的。”麻省理工学院的工程师，科学家克里斯托弗·卡尔在探索新闻中说。
For example, we can't find out if life is on Mars without going there. It could conceivably require nothing less than the resources of a full-blown human expedition.
例如，除了生活中那里，我们就不能知道火星上的生活是怎样的。
The photo shows us that there is no life on Mars.
这幅图片向我们表明了火星上没有生命。
There is plenty of ice on Mars, but the chemical reactions for life come to a halt when water freezes.
在火星上有大量的冰块，但是当水结冰时，形成生命的化学反应就会停止。
So far there is little evidence of life on Mars, but this doesn't justify the conclusion that space research has no scientific value.
迄今为止还没有充分证据表明火星上有生命，但这并不是说外层空间的研究没有科学价值。
Scientists assume that there is no life on Mars.
科学家们假定火星上没有生命。
Whether there is life on Mars is a mysterious and unsolved question.
火星上有没有生命是个未解开的迷。
Do you know there is no life on Mars? Not even micro-organism?
不是命我就生在火星了，为什么不是命？
Whether there is life on Mars is an interesting question.
火星上是否有生命是一个有趣的问题。
For example there is vast and undeniable proof that life has not only existed on your Moon and Mars, but still does to this day.
举个例子，这里有着大量的不可否认的证据，那就是生命已经不仅仅只存在于你们的月球和火星上，但是却一直拖延至今。
It may be safely assumed that there is no animal life on Mars.
可以有把握地认为火星上是没有动物生命的。
There is no convincing evidence to prove the existence of life on Mars.
没有令人信服的证据证明火星上有生命存在。
Some scientists assume that there is no life on Mars.
有些科学家认为火星上没有生命。
Some scientists assume that there is no life on Mars.
有些科学家认为火星上没有生命。
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