Europa, we also know, has an under-the-ice crust ocean.
我们知道木卫二拥有存在于冰层下的海洋。
Europa is fascinating, mostly silicate rock with an ice crust.
欧罗巴是迷人的，主要是硅酸盐岩石和冰壳。
It is very dangerous to walk on the thin crust of ice.
〔在这样一层薄冰上行走是很危险的。
It is very dangerous to walk on the thin crust of ice.
〔在这样一层薄冰上行走是很危险的。
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