两位太阳能漫游者，勇气号与机遇号，自从2004年在火星登录，本来计划执行一项为时90天的任务。
Spirit and Opportunity, two solar-powered rovers that landed on Mars in 2004, were built for a mission intended to last 90 days.
勇气号与机遇号探测器在2004年1月登上这红色星球，计划执行一项为期90天的任务，结果这任务持续了地球历6年，或者说3.2个火星年。
The Spirit and Opportunity rovers landed on the Red Planet in January 2004 for what was to be a 90-day mission, but which has lasted 6 Earth years, or 3.2 Mars years.
除了行驶速度慢（最高时速200米）和有陷入沙中的危险，勇气号与机遇号有其他缺陷。
Besides being slow (top speed 0.2kph) and at risk of sand traps, wheeled rovers like Spirit and Opportunity have other limitations.
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