But by measuring the way that Europa interacts with the magnetic field of Jupiter, and looking at how those cracks in the ice that you can see there on that graphic move around, we've inferred very strongly that there's an ocean of liquid surrounding the entire surface of Europa.
通过检测 欧罗巴卫星是怎样 同木星的磁场相互作用的， 和研究你在这种图片上可以看见的 冰面上的裂缝 我们很肯定的推测 欧罗巴的整个地表下，