Curiosity may be the last spacecraft landing on Mars for many years.
好奇可能将是许多年里的最后一个在火星登陆的太空船。
At present, our spacecraft are too slow to carry large Numbers of people to Mars.
眼下，我们的太空飞船太慢了，不能把大批人送到火星上。
At present, our spacecraft are too slow to carry large Numbers of people to Mars.
眼下，我们的太空飞船太慢了，不能把大批人送到火星上。
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