Thin: As applied to a photographic image, having low density. As applied to the physical properties of film, thin base film materials provide for more film per given roll diameter.

• 密度小；薄的：用于摄影影像时，表示密度低；用于表示胶片的物理特性时，在一定直径的片卷上，薄片基的胶片要长些。