曝光法则。经典的建议是：保证高光区曝光准确，低光区随他去。
Exposure rules: the classic advice is, "Expose for the highlights, and let the shadows take care of themselves."
大部分的时间里激光是暗的，产生低强度的光区伴随着偶尔短暂的高强度光的闪烁。
Most of the time the lasers are dark, producing areas of light with low intensities with the occasionally brief but brilliant flashes of high - intensity light.
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