名词
中文翻译：Unknown
同义词：
['pipe diameter', 'conduit diameter']
例句：
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1. The duct diameter of the pipeline is crucial for its performance.
管道的直径对于其性能至关重要。
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2. The engineers designed a new conduit with a larger duct diameter to improve flow efficiency.
工程师设计了一种新的导管，具有更大的直径以提高流动效率。
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3. The duct diameter of the ventilator is too small, which affects the airflow.
呼吸器的管道直径太小，影响了气流。