Crossing a line as sharp as if it had been drawn with a ruler, though there was no obvious visual difference, Spirit moved from pure, hard basalt to an area where every rock seemed to have been altered by water.

• 跨过一条像用尺子比好画出的直线后，虽没有明显的视觉差异，但“勇气号”将坚硬玄武岩抛在身后，进入了另一个区域，那里的每块岩石都似乎曾被水作用过。