名词
中文翻译：下降管
同义词：
['down-pipe', 'down-tube', 'down-conduit']
例句：
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1.The engineer designed the downcomer to reduce friction between the pipes.
工程师设计了下导管，以减少管道之间的摩擦。
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2. The downcomer is essential for maintaining proper water pressure in the system.
下导管对于保持系统内适当的水压至关重要。
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3. The downcomer was installed to prevent leaks and ensure safe operation of the machinery.
安装下导管是为了防止泄漏并确保机械设备的安全运行。