I think some of these photos are underexposed .

我觉得这些照片有些曝光不足。

But this comes at a price : less light enters the camera , causing the image to be underexposed .

但这会带来另一个问题：进入照相机的光线更少，以至于不能感光。

If you notice that histogram skews to the left , the image is probably too dark , or underexposed .

如果你发现直方图集中在左侧，说明图像太暗了，或者说曝光不足。

The underexposed highlight detail is then combined with information from the fully exposed other set of alternate lines , to produce a final image that reveals detail which might otherwise be lost in the shadows .

曝光不足的高光细节仍然与来自对变动的线条的另外一个集合的充分曝光，来产生一种最终影像，反应那些可能处于阴暗处而被丢失的细节。

Exposure latitude : degree to which film can be underexposed or overexposed and still yield satisfactory results .

曝光宽容度：胶片在曝光不足或曝光过度时，却仍然能够产生令人满意的结果的程度。