就和f值一样，这一组数字也是一个数列关系，每一档快门速度都是比上一档快一倍的时间，或者是慢一半的时间。
Just like with f-stops, there is a mathematical relationship between different shutter speeds-each shutter speed stays open half as long as the one above it, or twice as long the one below it.
双档自动增益控制，自动电子快门，电子光线控制。
Double gears auto gain control, auto electronic shutter, electronic light control.
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