名词
中文翻译：封闭的扩展
同义词：
['closed extension', 'closed extension device']
例句：
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1. The engineer designed a closed extension to improve the efficiency of the machine.
工程师设计了一个封闭扩展装置来提高机器的效率。
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2. The closed extension is used to connect two parts of the circuit together.
封闭扩展用于连接电路的两个部分。
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3. The closed extension was installed to prevent water from leaking into the basement.
安装封闭扩展以防止水渗入地下室。