什么是 substitute?One that takes the place of another: finding substitutes for coal; came in as a substitute at the end of the game.Grammar A word or construction used in place of another word, phrase, or clause.To put or use (a person or thing) in place of another: substituted plastic for steel to reduce the weight.Usage Problem To replace: substituted the worn-out couch with a new one; original artworks that were substituted by fakes.