名词
中文翻译：闭式导管
同义词：
['closed pipeline', 'closed conduit pipe例句：1. The closed conduit is used to transport oil and gas underground.（闭式导管用于地下输送石油和天然气。）2. The closed conduit system was designed to prevent leaks and ensure safe operation.（闭式导管系统设计用来防止泄漏并确保安全运行。）']
例句：
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1. The closed conduit is used to transport oil and gas underground.
闭式导管用于地下输送石油和天然气。
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2. The closed conduit system was designed to prevent leaks and ensure safe operation.
闭式导管系统设计用来防止泄漏并确保安全运行。
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3. The closed conduit was installed in the tunnel to reduce noise pollution.
在隧道中安装了闭式导管以减少噪音污染。