名词
中文翻译：管中管系统
同义词：
['pipe-in-pipe system', 'double-walled tube', 'double-walled pipe']
例句：
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1. Thenew tube-in-tube system is more energy efficient than the old one.
新的管中管系统比旧的更节能。
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2. The engineer designed the double-walled tube to withstand high pressure.
工程师设计了双层壁管以承受高压。
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3.The double-walled pipe was used in the construction of the underground tunnel.
双层壁管用于地下隧道的建设。