The camera has already got a roll of color film in it.
这架相机里已经装有一卷彩色底片.
I want a roll of 36 exposures of color film, Please.
请给我一卷36张的彩色胶卷.
How many photos can be taken with a roll of film?
一卷胶卷可拍多少张照片?
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