名词
中文翻译：封闭的管道
同义词：
['closed conduit', 'sealed tube']
例句：
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1. The engineer used a closed tubeto transport the oil.
工程师使用一个封闭的管道来输送石油。
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2. Theclosed tube was used asa filter in the water treatmentplant.
这个封闭的管道被用作水处理厂的过滤器。
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3. The closed tube isessential for maintaining the integrity of the pipeline.
这个封闭的管道对于保持管道的完整性至关重要。