名词
中文翻译：外壳
同义词：
['shell', 'outer layer']
例句：
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1.The scientist found the capsule and carefully opened it to examine its contents.
科学家发现了这个胶囊，并小心翼翼地打开它来检查里面的内容。
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2. The spacecraft landed on a deserted planet, revealing a Capsula externa beneath the surface.
宇宙飞船降落在一个荒废的星球上，在地表下发现了一个外壳。
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3.The scientists discovered that the Capsula externa was not as sturdy as they had thought.
科学家们发现外壳并不像他们想象的那样坚固。