Bike or hike for hours along a shell-covered coastline.
可以在满是贝壳的海岸线骑车或远足;
It drinks juice from tree roots and it is covered in a hard shell.
它喝树根的汁液,并且有一层硬壳覆盖着。
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。
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