阅读下面这首唐诗，回答问题。
                                                                                                           池 鹤
                                                                                                          白居易
                                                            高竹笼前无伴侣，乱鸡群里有风标^①。低头乍恐丹砂落，晒翅常疑白雪消。
                                                            转觉鸬鹚毛色下，苦嫌鹦鹉语声娇。临风一唳思何事？怅望青田云水遥。
     【注释】①风标，风度节操。