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當我們利用不同的標記方法去逐步揭開更多雀鳥的秘密時，Graham Appleton報告了他為數隻雨燕加上標記後所得到的精彩研究結果，令這種世上其中一種最神秘雀鳥的生活得以曝光。
As we begin to unravel the secrets of more of our birds with the use of various types of tags, Graham Appleton reports on the fascinating results being revealed by tagged individuals of one of our most enigmatic birds: the Swift.

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