sheep的复数形式是：sheep。sheep的意思是“羊，绵羊”，是可数名词，单复数同形。sheep用于比喻可表示人“胆小”。词汇搭配：sheepandgoats，善人与恶人，好人与坏人；aflockofsheep，一群羊；sheepskin绵羊毛皮。常用短语：awolfinsheep'sclothing，披着羊皮的狼。sbwhoappearstobeharmlessbutisinfactdangerous；blacksheep，害群之马，败类，不肖之子。sbwhodoesnotconformtothefamily'swishes；countsheep，心里计数以求入睡。keepcountingtooneselfinanattempttofallasleep。