negative film的用法和樣例：
例句
- Please buy a roll of film for me.
請給我買(mǎi)一卷底片。 - This is a 35-millimeter film with 26 exposures.
這是二十六張裝的三十五毫米底片。 - Place one of the negative records in the projector object plane.
將負片記錄之一放入投影器的物平面內。 - The measured difference between the maximum and minimum densities of a particular film negative or positive.
中義正片或負片上最大濃度與最小濃度的測量差值。
