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.
勇气号发现高原上有许多蛋白石的沉积物。
Spirit found the plateau to be surrounded by deposits of opal.
勇气号还可以继续观测气候。它的加速度计可以用作地震检波器，检测火星的地震情况。
The Spirit could also continue to take weather measurements, and its accelerometers could act as seismometers, listening for Mars quakes.
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