to substitute for; to replace; to supersede[cedict]
胶片
jiāo piànㄐㄧㄠ ㄆㄧㄢˋ
(photographic) film[cedict]
作为
zuò wéiㄗㄨㄛˋ ㄨㄟˊ
one's conduct; deed; activity; accomplishment; achievement; to act as; as (in the capacity of); qua; to view as; to look upon (sth as); to take sth to be[cedict]
最
zuìㄗㄨㄟˋ
most; the most; -est[cedict]
主要
zhǔ yàoㄓㄨˇ ㄧㄠˋ
main; principal; major; primary[cedict]
的
deㄉㄜ˙
díㄉㄧˊ
dìㄉㄧˋ
of; structural particle: used before a noun, linking it to preceding possessive or descriptive attributive[cedict]