代講

(1)be a substitute; "The young teacher had to substitute for the sick colleague"; "The skim milk substitutes for cream--we are on a strict diet"

(2)代用品にする

(1)The young teacher had to substitute for the sick colleague

(2)若い教師は病気の同僚の代わりをしなければならなかった

(3)The skim milk substitutes for cream--we are on a strict diet

(4)スキムミルクをクリームに代用する・・・私たちは厳しいダイエット中だ