他失神地望着窗外。He looked vacantly out of the window.她双唇微张，失神地望着前方。She was staring into space, her mouth slack.他那失神的样子使我怀疑他是否在听.The vacancy of his expression made me doubt if he was listening....
There's a world of difference between an amateur video and a slick Hollywood production.业余制作的录像短片与好莱坞制作精湛的电影作品有天壤之别。An amateur shouldn't play roulette for high stakes.外行不该下大赌注赌轮盘赌....a keen amateur photographer...