但是要确认这个假设的表面下海洋的存在，并不像听上去那么简单。
But the presence of the hypothesized subsurface ocean isn't as simple to confirm as it sounds.
木卫三是木星在太阳系中最大的卫星，它的地下海洋可能在表面以下近100英里处，这给了我们可能有地外生命的希望。
The subterranean ocean likely lies nearly 100 miles below the surface of Jupiter's moon, the largest natural satellite in the solar system, giving hope that life beyond Earth is possible.
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