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到今年4月12日，美国航天飞机“工龄”将满20年。为保证这种高超音速航天运输工具能安全使用到2010年以后，美国航宇局正在继续推进一系列技术升级计划。从现在起到2005年，该局将花近16亿美元对航天飞机系统进行各方面的安全性改进。该局还将另外拿出6.3亿美元改进肯尼迪航天
As of April 12 this year, the “length of service” of the U.S. space shuttle will reach 20 years. To ensure the safe use of such hypersonic spacecraft after 2010, NASA is continuing to promote a series of technology upgrades. From now until 2005, the agency will spend nearly $ 1.6 billion on various aspects of the space shuttle system for safety improvements. The council will also come up with another 630 million U.S. dollars to improve Kennedy Space