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。

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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。

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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。

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