It takes place in Russia .
It helps scientists know how well humans will be on a long journey to Mars.
63 第一个It's 第二个to fly
他们中的任何人如果感到身体不适都可以退出实验.
The experiment of Mars 500
Mars ( 火星 ) is the planet most like Earth.( 1 ) Flying to Ma
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Mars is the fourth planet from the sun and it's the most ___
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翻译：The most one is the minor planet idea .
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