After the first 20 years of exploration, focus shifted from one-off flights to renewable hardware, such as the Space Shuttle program, and from competition to cooperation as with the International Space Station (ISS).
在前20年的探索之后，重点从一次性的飞行转移到可重新使用的硬件，例如航天飞机计划，并从竞争走向合作，建立了国际空间站（ISS）。