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There are several bird nest base is busy in preparation for the winter then.
还有鸟儿正忙着垒窝儿，准备过冬呢。
youdao
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It will be a base line for future bird studies all over the world.
这将是未来全世界研究鸟类的一个基准。
youdao
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It will be a base line for future bird studies all over the world.
这将是未来全世界研究鸟类的一个基准。
youdao