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2013-05-23 12:21
求翻译：currently , nasa’s [（美国）国家航空航天局] manned space exploration program focuses on the space shuttle program . nasa now operates three space shuttles , discovery , atlanatis , and endeavor . unfortunately , two of nasa’s shuttles , challenger and columbia , have been lost through accidents . seven astronauts died in each acc是什么意思？ 待解决
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currently , nasa’s [（美国）国家航空航天局] manned space exploration program focuses on the space shuttle program . nasa now operates three space shuttles , discovery , atlanatis , and endeavor . unfortunately , two of nasa’s shuttles , challenger and columbia , have been lost through accidents . seven astronauts died in each acc
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