surrogate

n. 代理,代理人,代用品

surmountable, surname, surnamed, surpass, surpassing, surpassingly, surplice, surplus, surprise, surprised, surprising, surprisingly, surreal, surrealism, surrealist, surrealistic, surrender, surreptitious, surreptitiously, surrey, surround, surrounding, surroundings, surtax, surveillance, survey, surveyor, survival, survive, surviving, survivor, sus (also suss), susceptibility, susceptible, suspect, suspect sb. of, suspend, suspended, suspended animation, suspender,