我需要买一卷胶片来拍照。
wǒ xūyào mǎiyī juàn jiāopiàn lái pāizhào 。
I need to buy a roll of film to take pictures.
这部相机只能使用胶片。
zhè bù xiàngjī zhǐnéng shǐyòng jiāopiàn 。
This camera can only use film.
在数码相机普及之前，胶片是主要的摄影材料。
zài shùmǎ xiàngjī pǔjí zhīqián ， jiāopiàn shì zhǔyào de shèyǐng cáiliào 。
Before digital cameras became popular, film was the main photography material.