名词中文翻译1
中文翻译：Unknown
同义词：
['hard outer layer', 'hard shell', 'outer casing']
例句：
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1. The egg is covered with a hard outer layer that protects the contents inside.
这个蛋被一个硬的外层覆盖，保护了里面的内容。
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2. The turtle's shell is made of a hard outer layer that provides protection from predators.
乌龟的壳是硬的外层，提供了对捕食者的防护。
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3. The carpenter used a hammer to remove the hard outer layer of the wooden door.
木匠用锤子把木头门的硬外层敲掉了。