If you converted those craters' water into rocket fuel, you'd have enough fuel to launch the equivalent of one space shuttle per day for more than 2000 years.

如果你将这些环形山里的水分转化成火箭燃料，你足以在2000多年的时间里每年发射一架相当于航天飞机的航天器。

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And if NASA can't get the space shuttle to fly for four more years, the US is in a big hole in terms of human space flight because there's nothing to replace it coming along for about five more years.

NPR: Former Astronaut on NASA Risk Assessment