自动曝光，程序自动曝光P（可进行程序微调），光圈优先（A），快门优先（S），手动曝光（M）
Programmed auto exposure, Aperture Priority Auto and Shutter Priority Auto, Manual exposure. ; AE lock.
程序模式实际上是一种半自动模式，P代表可编程化的拍摄模式。实际使用中，相机仍然工作在自动曝光模式。
The “P” mode is in reality a semi auto mode, that is the P is the first in the line of programmed modes, but in practical use, the camera still continues to do auto exposure.
在自动模式和程序模式之下，相机一般会选择一个不大不小的光圈和快门来进行适当的曝光，但这样既不会有任何极端参数，也就更失去了创造的机会。
In auto mode and program mode, the camera usually chooses middle-of-the-road aperture and shutter Settings, getting a good exposure but avoiding any extremes-and any creativity as well.
在自动模式和程序模式之下，相机一般会选择一个不大不小的光圈和快门来进行适当的曝光，但这样既不会有任何极端参数，也就更失去了创造的机会。
In auto mode and program mode, the camera usually chooses middle-of-the-road aperture and shutter Settings, getting a good exposure but avoiding any extremes-and any creativity as well.
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