美国宇航局有条不紊的火星探索方式尚未解决这些问题。
NASA's methodical approach to the exploration of Mars has not yet answered the questions.
不伦不载人的探测器能否在火星上发现生命迹象。
火星500实验，如果像一些专家所深信不疑的那样，主要目的是宣传人类飞往那颗红色星球的概念，那么它已经确定无疑超越了所有人预期成功地达到了目的。
If, as some experts believe, the main aim of the Mars 500 experiment is to publicise the concept of human flight to the red planet, then it has surely succeeded beyond all expectations.
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