名词
中文翻译：下壳
同义词：
['lower shell', 'lower case例句：1. The lower casing of the machine is made of steel.（这台机器的下壳是用钢制成的。）']
例句：
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1. The lower casing of the machine is made of steel.
这台机器的下壳是用钢制成的。
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2.The lower casing of the car is made of plastic.
汽车的下壳是用塑料制成的。
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3. The lower casing of the computer is designed to protect the motherboard.
电脑的下壳设计用来保护主板。