名词
中文翻译：下游线路
同义词：
['downriver line', 'lower-level line', 'lower-level pipeline']
例句：
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1.The engineer designed the downriver line to divert water from the river.
工程师设计了这条下游线路，将水从河流中引走。
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2. The construction of the lower-level line is expected to start next month.
预计下个月开始建设这条低层级线路。
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3. The lower-level pipeline was built to transport waste gases from the factory.
这条低层级管道被建造来输送工厂的废气。