This means keeping the cage hooded and arranging for the new bird to hear other huamei sing, until it gets the idea and joins in.
野鳥入籠，換了環境，短時間不敢啼唱；非飼主安排，也無法聽到同類的呼喚。溜鳥的目的在喚回它喜愛鳴唱的本性，進而學習別人家畫眉的叫聲，使它叫得更好。