名词中文翻译
中文翻译：回流管
同义词：
['return pipe', 'return conduit']
例句：
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1.The back drain is blocked by a piece of debris.
后排水管被一块杂物堵塞了。
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2. The engineers had to clear the back drain before starting work.
工程师们必须清理好后排水管才能开始工作。
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3.The water level in the back drain has been rising steadily for weeks.
后排水管中的水位已经持续几周在上升。