在书上见到对于蝉叫声的描写都是"知了,知了",牛"哞哞",羊"咩咩"
1http://mp3.baidu.com/m?f=ms&tn=baidump3&ct=134217728&lf=&rn=&word=%B2%F5%C9%F9&lm=-12http://mp3.baidu.com/m?f=ms&tn=baidump3&ct=134217728&lf=&rn=&word=%C5%A3%BD%D0&lm=-13http://mp3.baidu.com/m?f=ms&tn=baidump3&ct=134217728&lf=&rn=&word=%D1%F2%BD%D0&lm=-1
http://mp3.baidu.com/m?f=ms&tn=baidump3&ct=134217728&lf=&rn=&word=%B6%AF%CE%EF%A3%AC%BD%D0%C9%F9&lm=-1