在自动模式和程序模式当中，相机自己会决定快门速度。
In auto mode and program mode, the camera decides what shutter speed is needed.
本系列的第一部分当中，数码单反相机中的程序模式已经帮助你将自动模式丢到了一边。
In part one of this series you kicked your digital SLR camera's auto mode to the curb with the help of program mode.
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.
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