It is not clear whether the breeding population around the Zhoushan islands mixes with the one on Mazu. Nor is the birds' wintering range known-possibly the Philippines, Borneo and perhaps Myanmar.
目前舟山群岛和妈祖所有繁殖鸟类的总数还不明确，鸟类过冬的范围也不明确——可能是菲律宾，婆罗洲或者是缅甸。
Firstly, there are many habitats for wintering of migratory birds in the mainland, so it is possible for WNV to enter our country with migrating of the birds.
我国地域广大，有大量的鸟类栖息地和候鸟越冬地，存在WNV随候鸟进入我国的途径；
So this has been very helpful with recent work, locating exactly where birds are going, and trying to find out how they move from the wintering area to the breeding area.
新的技术对科研工作帮助很大，科学家可以精确的判断鸟的方位，以及它们从越冬地飞往繁殖地的迁徙路径。
That's how the birds return to the same breeding, wintering, and stopover sites year after year.
这就是鸟儿如何年复一年地回到同一个繁殖地、过冬地和途经地的。
The V-shaped formations filled with honking birds are a fall staple as the breed migrates to wintering grounds in the southern United States and even northeastern Mexico.
V 形与鸣喇叭鸟类充满编队是一种象征侯鸟迁移到南方越冬地及美国，甚至墨西哥东北部。
But researchers say the only explanation for why so many birds over such a broad area are wintering in more-northern locales is global warming.
但是研究者说能解释在这么大范围内有这么多鸟类往北迁移过冬的唯一原因就是全球变暖。
The migratory birds fly thousands of kilometers each spring from wintering grounds in Africa to Europe, where they breed.
此种候鸟每年春天从非洲的寒冷地带飞行数千公里到欧洲觅食繁衍。
The migratory birds fly thousands of kilometers each spring from wintering grounds in Africa to Europe, where they breed.
此种候鸟每年春天从非洲的寒冷地带飞行数千公里到欧洲觅食繁衍。
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