air shutter lever 关气杆
fan shutter adjustment lever 风扇进风门调节杆
fan efficiency shutter adjustment lever 风扇进风门调节杆
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The condenser is equipped with an iris diaphragm, a shutter controlled by a lever which is used to regulate the amount of light entering the lens system.
聚光镜装配有瞳孔膜，那是一个有贡杆控制的快门，用来调节进入镜头系统的光量。
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