一定介质或材料(例如照相感光纸)的不透光程度。
The degree of optical opacity of a medium or material, As of a photographic negative.
摄影作品，是指借助器械在感光材料或者其他介质上记录客观物体形象的艺术作品；
"photographic works" means artistic works created by recording images of objects on light-sensitive or other materials with the aid of devices;
采用感光胶片作为阻挡介质的针-板放电系统，解析空气中固体电介质上纳秒正脉冲表面放电的形成过程。
To analyze the formation of surface discharge on a dielectric plate under positive nanosecond impulse voltage in air, a wire to plane electrode system with a barrier of negative film was used.
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