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2013-05-23 12:21
求翻译：some scientists believe that birds do sing some of the time just because they are happy. however,they sing most of the time for a very different reason.their singing is actually a warning to other birds to stay out of their territory.是什么意思？ 待解决
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some scientists believe that birds do sing some of the time just because they are happy. however,they sing most of the time for a very different reason.their singing is actually a warning to other birds to stay out of their territory.
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