| 摘要 |
A space transportation system which contemplates the use of multiple spacecraft or space-based base of operation, made up of at least two classes of objects which have the potential for repeated use: a) a relatively massive class of objects (Az, Ax, Ay) (man-made such as space stations and man-altered naturally occurring objects such as asteroids or comets); and b) a relatively less massive class of objects (spacecraft such as the shuttle orbiter or lunar or deep-space vehicles).
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