第二个是，这种通常的统计噪声来源于你试图估量一个巨大的数字就像通过两种方法得到的美国就业人数。
The second is that this is the usual statistical noise you get from trying to measure a huge number like the number of employed Americans through two different methods.
由于各种原因，数字摄像机会产生噪声，所以在帧之间像素很难维持完全一样的颜色值。
Due to various issues with digital cameras involving noise, pixels will rarely maintain their exact color value between frames.
如果做法正确无误，数字电视运营商甚至能使最老式的模拟电视机出来的图像更清晰——没有重影和别的电子噪声，来损害模拟广播电视质量。
Done correctly, digital broadcasting can make images sharper on even the oldest of analogue sets-with none of the "ghosting" and other electronic noise that marred analogue broadcasting.
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