科学家们认为他们已经发现了外星生命的证据. Scientists believe they have found evidence of extraterrestrial life.

科学家们从亚里士多德时代就一直在寻找外星生命, 但新的发现可能最终提供了它们存在的证据. Scientists have been searching for extraterrestrial life since the time of Aristotle, but a new discovery may finally provide evidence of their existence.