Sent_en: 2zh Space exploration is a dream deeply rooted in humanity, and the seven brave astronauts of Columbia sacrificed their lives so the rest of mankind could realize that dream, said Bush's letter.
Sent_yy: 布什的信中说，“太空探索是一个深深扎根于人类的梦想，哥伦比亚的七位勇敢的宇航员为了这一梦想牺牲了自己的生命，所以其余的人才有可能实现这一梦想。”