名词
中文翻译：三级流水
同义词：
['tertiary stream', 'tertiary flow']
例句：
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1.The third-order stream is a crucial part of the ecosystem.
三级流水是生态系统中至关重要的一部分。
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2. The engineer designed a system to control the third-order stream.
工程师设计了一个系统来控制三级流水。
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3. The third-order stream is responsible for filtering and purifying the water.
三级流水负责过滤和净化水。