1、
An apparatus for measuring the optical density of a material, such as a photographic negative.
测量在非常小的密度内变化的一种特殊的显像密度计.
互联网摘选
2、
Not having enough photographic density or contrast to make satisfactory prints.
明暗对比低的:摄影密度不足或无法获得满意的照片.
互联网摘选
