名词
中文翻译：门槛管
同义词：
['throat tube', 'throat tube例句：1. The engineer designed a threshold tube to improve the efficiency of the machine.（工程师设计了一个门槛管，以提高机器的效率。）']
例句：
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1. The engineer designed a threshold tube to improve the efficiency of the machine.
工程师设计了一个门槛管，以提高机器的效率。
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2.The new model has a threshold tube that can detect small particles in the air.
新款模型有一个可以检测空气中小颗粒的门槛管。
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3. The threshold tube is essential for maintaining the proper functioning of the ventilation system.
门槛管对于保持通风系统的正常运行至关重要。