diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening 同义词：iris,
例句与用法
1.
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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