名词
中文翻译：直管
同义词：
['tube', 'tubercles', 'duct']
例句：
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1. The engineer designed a new type of tubular heat exchanger.
工程师设计了一种新型的管状换热器。
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2. The bacteria in the soil are responsible for the growth of tubular fungi.
土壤中的细菌负责生长管状真菌。
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3. The scientist observed the movement of molecules through the tubular structure.
科学家观察到分子通过管状结构的运动。