名词
中文翻译：外壳
同义词：
['casing', 'outer shell', 'husk']
例句：
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1. The turtle's shell is a unique feature of its body.
乌龟的壳是它身体的一个独特特征。
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2. The scientist used a microscope to examine the inner workings of the shell.
科学家使用显微镜检查贝壳的内部结构。
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3. The shell was so fragile that it broke easily under the pressure of water.
这个贝壳很脆弱，在水的压强下很容易就碎了。