p mode meaning in English

模、压力模

If ambient light levels are not bright ( below 10 ev ) then p mode assumes that you want to illuminate the foreground subject with the flash
如果环境光不是非常强（ 10ev以下）， p档假设你是要用闪光灯照亮被摄主体。
Because the camera tries to keep the shutter speed at a reasonable speed for handholding the camera you will end up with dark or black backgrounds if you take a flash photo in p mode when ambient light levels are not bright
当你使用p档，环境光又不够强，而相机为了手持还要使用合理的快门速度，结果是照片的背景很暗或者全黑。