机遇号对于火星地理结构的解读总是揭示出一个存在于远古火星的，来自于海洋性酸股介水坑的废弃风沙之地。
The geologic story the Opportunity read there always spoke of an ancient martian wasteland of windblown dunes pocked by the occasional acid-laced puddle.
2004年，两个名为“勇气号”和“机遇号”的探测器或“漫游者”被派去寻找水的迹象。
In 2004, two robot explorers, or 'rovers', called Spirit and Opportunity were sent to look for signs of water.
勇气号和机遇号每年的操纵成本为2千万美元。
Operating the Spirit and the Opportunity costs $20 million a year.
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