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30 volunteers that will be sent to the Mars will be selected all over the world by 2015.
They will be ready for not returning to the earth any more and they will keep good relationships with others.
Life on the Mars is very arduous. People there are faced with extreme cold and fear.
帮忙翻译成英语、不要用翻译工具的、
Once upon a time, there was an eagle on the tree, then a cat climed up, thus there are owls.