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.
这个半自动的模式是控制景深并保证良好曝光的绝好方式。
Aperture Priority Mode is a great way to control depth of field as it will ensure your images are well exposed.
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.
自动曝光锁定模式能锁定精确曝光测定时的曝光值。
The AE lock mode locks the exposure value for precise exposure metering.
自动曝光锁定模式能锁定精确曝光测定时的曝光值。
The AE lock mode locks the exposure value for precise exposure metering.
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