现在你已经了解了这两个参数——快门速度和光圈大小，他们从本质上来说有同一个功能：控制进入相机的光线总量。
So you have these two parameters, shutter speed and aperture size, both of which do essentially the same thing: control how much light gets in.
布列松用胶卷机同一个镜头，没有闪光灯，同样的快门——他不需要最新的数码设备也可以拍好照片。
Cartier-Bresson used film camera, same lens, no flash, same shutter speed - he didn't need the newest digital equipment to take great photos.
能多次曝光拍摄，当快门按钮按下时，胶卷不会卷动，可实现在同一底片上多次曝光。
Enables multi exposure shooting. The film does not advance when the shutter button is pressed to allow taking several exposures on the same frame.
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