在物理镜头系统中，光圈调整光线进入系统的数量极限。
In a physical lens system, the aperture is adjusted to limit the amount of light entering the system.
尝试用不同快门速度拍摄，由低到高(调整光圈以获得正确曝光)，注意观察它为你的拍摄带来了何种影响。
Photograph it at different shutter speeds, from slow to fast (adjust your aperture to maintain correct exposure), and see what affect it has on the appearance of the subject in the photo.
这种模式需要较充足的光线，并且你不能在拍摄的时候调整光圈。
This mode needs a lot of light, and you can't adjust the aperture yourself.
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