研究人员们发现了火星上存在液态水体的证据。这片被科学家认作是湖的水体位于该行星南极的冰盖底部，横跨约二十公里（十二英里）。 文字稿 Since Nasa's Viking Mission tested Martian soil samples back in the 1970s, we've known the surface of Mars to be a desert – ...