科普：美国宇航局NASA的火星登陆计划是什么？
WHAT ARE NASA'S PLANS FOR A MANNED MISSION TO MARS?
2017年5月，美国宇航局负责政策和计划事务的副协理署长格雷格·威廉姆斯概述了NASA的四阶段计划和预期的时间框架，希望有朝一日可以让人类访问火星。
In May 2017, Greg Williams, deputy associate administrator for policy and plans at Nasa, outlined the space agency's four stage plan that it hopes will one day allow humans to visit Mars, as well as its expected time-frame.
第一阶段和第二阶段将涉及多次探索月球空间，以建造一个栖息地，为火星之旅提供一个集结区。
Phase one and two will involve multiple trips to lunar space, to allow for construction of a habitat which will provide a staging area for the journey.
最后交付的硬件将是实际的深太空运输车，将用于将宇航员们运送到火星。
The last piece of delivered hardware would be the actual Deep Space Transport vehicle that would later be used to carry a crew to Mars.
2027年将进行为期一年的模拟火星生活。
And a year-long simulation of life on Mars will be conducted in 2027.
第三阶段和第四阶段将2030年之后开始，将包括对火星系统和火星地表的持续探险。
Phase three and and four will begin after 2030 and will involve sustained crew expeditions to the Martian system and surface of Mars.
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