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婉轉(zhuǎn)，清麗，高亢，鳥(niǎo)兒在枝頭歡唱。世界自然紀(jì)錄片之父愛(ài)登堡老爵爺講述鳥(niǎo)類鳴叫對(duì)于種群的意義?！ avid Attenborough chooses seven of the most remarkable animal songs found in nature and explores the significance of these songs in the lives of their species.