名词
中文翻译：外层球体
同义词：
['outer sphere', 'outer layer']
例句：
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1. The outer sphere of the planet is made up of a thick atmosphere.
行星的外层由浓厚的大气组成。
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2. The outer layer of the skin is responsible for protecting it from the elements.
皮肤的外层负责保护它免受外界环境的影响。
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3. The outer layer of the ocean is home to a diverse range of marine life.
海洋的外层是各种海洋生物的家园。