太空探测器提供的证据表明，木卫二表面下有一个巨大的海洋。
Space probes have provided evidence that Europa has a large ocean under its surface.
照片证据表明，液态水曾大量存在于火星表面。
Photographic evidence suggests that liquid water once existed in great quantity on the surface of Mars.
目前，有可靠的科学证据表明，澳大利亚最早的岩石表面艺术创作可追溯到3万至5万年前。
Currently, reliable scientific evidence dates the earliest creation of art on rock surfaces in Australia to somewhere between 30,000 and 50,000 years ago.
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