dual vent

例句：

1. 1. The new design features a dual ventilation system to improve airflow efficiency.
   新设计采用双重通风系统以提高空气流通效率。
2. 2. The building has two dual vents for exhaust and intake.
   这栋建筑有两个用于排气和进气的双通口。
3. 3. The engineer designed the dual vents to ensure proper air circulation in the workshop.
   工程师设计了双通口以确保车间内的空气流通正常。