很多年以不,美国宇航局一直致力于探索火星上是否存在着生命。当然,科学家并不指望在那颗红色行星上能挂起“欢迎地球人”的牌了子。但是,他们新近发现的一连串物证的确表明,从过去到现在,火星说不定就是除地球以外的另一个生命发源地。 Not for many years, NASA has been working to explore the existence of life on Mars. Of course, scientists do not expect to hang the “Welcome to Earth” card on that red planet. However, their recent discovery of a series of physical evidence indeed shows that from the past to the present, Mars may be another birthplace other than the Earth.