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.
这颗轨道飞行器的任务是在火星表面寻找水的证据，而且水量必须足以为生命栖息地维持相当长一段时间。
The orbiter was commissioned to search for evidence that water persisted on the surface of Mars for a substantial period of time - long enough to provide a habitat for life.
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