1. In photography, the essential light sensitive coating on ph otographic film comprising gelatine and silver salts. 
   在照相技术中，覆盖在照相底片上的由胶和银盐组成的感光物质。
2. a light-sensitive coating on paper or film; consists of fine grains of silver bromide suspended in a gelatin. 
   身份证或胶卷外面的感光层；包含着悬浮在白明胶上面的优质溴化银颗粒。
3. A photosensitive coating, usually of silver halide grains in a thin gelatin layer, on photographic film, paper, or glass. 
   感光乳剂一种感光覆盖层，通常是银的卤化物颗粒在感光胶片、纸或玻璃上的一薄层胶体
4. history of coating industry 
   涂料工业发展史
5. spray painting and coating 
   涂料饰面

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