So Saturn might once have had more-one of which could have had a rocky core surrounded by a shell of water ice.

因此，土星也许曾经拥有多个颗卫星，其中一颗可能是冰层包裹着岩石内核的样子。

youdao

Europa is covered in a shell of water ice that's thought to hide an ocean of liquid water below. Liquid water is a key ingredient for life as we know it.

木卫二由水冻冰层所覆盖，人们认为其下流动着大量的液态水，而正如人们所知，液态水是生命存在的重要因素。

youdao

So Saturn might once have had more—one of which could have had a rocky core surroundedby a shell of water ice.

所以土星也许曾经有过多个卫星-其中一个可能是由水冰外壳包裹着岩石核心构成。 。

youdao

And Shell plausibly argues that Alaska's melting ice will make its operations more difficult to plan by forcing it to prepare for a wider range of conditions.

ECONOMIST: Resources: Hidden treasure | The

The festival's theme this year is "under the sea, " and the organizers planned nautical touches to the palace, such as an octopus ice sculpture and a throne shaped like a scallop shell.

WSJ: NY inmates help build ice palace in Adirondacks

But Shell says it has a solution for that, a giant underground wall of ice.

NPR: Industry Seeks to Extract Oil from Rocky Mountain Shale