negative film

• 底片

negative film的用法和样例：

例句

1. Please buy a roll of film for me.
   请给我买一卷底片。
2. This is a 35-millimeter film with 26 exposures.
   这是二十六张装的三十五毫米底片。
3. Place one of the negative records in the projector object plane.
   将负片记录之一放入投影器的物平面内。
4. The measured difference between the maximum and minimum densities of a particular film negative or positive.
   中义正片或负片上最大浓度与最小浓度的测量差值。