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The United States and China recently dispatched rovers to Mars, while the United Arab Emirates sent an orbiter to the red planet, where it is hoped humans one day will tread.

美国和中国最近向火星发射了探测器，同时阿联酋航空公司也向这颗红色星球发射了一颗人造卫星，希望有一天人类会踏上这片土地。

For man and machine alike, experts say landing on Mars is the hardest part of the trip.

专家表示，对于人和机器来说，登陆火星是旅程中最困难的部分。

The period from hitting the atmosphere to getting to the surface has been characterized depending on the mission as either the six minutes of terror or the seven minutes of terror.

从进入大气层到抵达表面的这段时间，根据不同的任务，被描述为“恐怖六分钟”或“恐怖七分钟”。

Mars has a thinner atmosphere than earth which complicates setting down safely on the surface.

火星的大气层比地球稀薄，这使得在火星表面安全降落变得困难。

Stanford University professor Scott Hubbard says, those six or seven minutes it takes to go from more than 19,000 kilometers per hour to zero are the riskiest.

斯坦福大学教授斯科特·哈伯德(Scott Hubbard)说，从每小时超过19000公里的速度降到零所需的六七分钟是最危险的。

In terms of where the risk factors are where you could lose this mission, that is an area that is of all the risk factors the one that you look at the most closely, because it's the one that has failed missions in the past.

就可能导致任务失败的风险因素而言，这是你最需要密切关注的一个方面，因为过去失败的任务都与此有关。

The casualty rate for Mars missions tops 50 percent. The US so far has successfully put a craft on the Martian surface, beginning with the Twin Vikings in 1976.

火星任务的伤亡率高达50%。到目前为止，美国至今已成功将航天器送上火星表面，最早可追溯到1976年发射的“海盗号”双子探测器。

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