Leading:人类一直努力寻找宇宙中的其他生命迹象,至今未果,但最近美国国家航空航天局的最新发现似乎意味着一些实质性进展。For decades,looking for life elsewhere in the universe meant listening for signals that could be from distant civilizations.But recent breakthroughs in space technology refocused some of that effort toward Leading: The human race has been struggling to find other signs of life in the universe and has failed so far, but recent NASA findings seem to imply some substantive progress. For decades, looking for life elsewhere in the universe meant listening for signals that could be from distant civilizations.