航天计划的结束给宇航员们留下了仅仅原有飞行机会的其中一小部分。
The shuttle program's end leaves just a fraction of the flight opportunities astronauts usually have each year.
美国宇航局希望尽快开始飞行，以尽可能结束美国载人航天计划的时间间距。
NASA is hoping to start flying as soon as possible to close the gap in the U. S. manned space program.
美国宇航局希望尽快开始飞行，以尽可能结束美国载人航天计划的时间间距。
NASA is hoping to start flying as soon as possible to close the gap in the U.S. manned space program.
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