NASA to test flying saucer
NASA拟测试降落伞
NASA plans to try out the largest parachute ever deployed during a flying saucer launch that will test new technologies for landing on Mars.
美国宇航局计划在一次飞碟发射中测试着陆火星的新技术，试验史上最大的降落伞。

The US space agency figured out how to do this decades ago, but with the goal of sending humans to Mars in the 2030s, the agency is now testing the Supersonic Ringsail Parachute that is 30 meters in diameter, which could allow even heavier spacecraft to land softly by slowing the entry vehicle from Mach 2 to subsonic speeds.
美国宇航局早在几十年前就已掌握使用降落伞减速技术，但该局计划于本世纪30年代将宇航员送到火星，因而将对"超音速环帆降落伞"进行测试。该降落伞直径达30米，可以把飞行器的速度从两倍音速减至亚音速，让载重更大的飞行器平稳降落。