Working out bird migration patterns was one of the triumphs of natural history.
找出鸟类迁移规律才是自然学史上无数可嘉可贺的成就之一。
John:We've been able to learn a lot of new things about bird migration, especially about how fast and how far birds move.
我们获取了很多新的信息，特别是鸟的飞行速度和距离。
When a banded bird is recaptured and reported, we learn about its migration route, its growth, and how long it has been alive, its lifespan.
当一只被戴了标记环的鸟被重新捕获时，我们就能从报告中了解其迁徙路线、生长情况以及存活时间、寿命。
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