His mother rehearsed his lines with him and by the time the play opened he was word-perfect.他妈妈跟他对台词，到演出开始时他已经背得滚瓜烂熟了。His mother rehearsed his lines with him and by the time the play opened he was letter-perfect.他妈妈跟他对台词，到演出开始时他已经背得滚瓜烂熟了。She rehearsed her speech until she was word-perfect.她反复练习，直到把讲稿背得滚瓜烂熟。