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.
一些科学家相信，鸟类有时唱歌的确是因为自己很快乐。然而它们大多数时候是因为不同的原因而唱歌的。
They sing Happy Birthday to me. My mother makes a big cake for me. I cut the cake into small pieces and give them out. we sing and dance.
他们唱生日快乐给我。我为我妈妈做一个大蛋糕。我把蛋糕切成小块给他们。我们唱歌跳舞。
However, I always thought that singing is their own thing, glad, unhappy, regardless of whether, as long as the brave to sing, sing loud and clear that they are that happy harvest!
不过，我一直以为唱歌是属于自己的事情，开心，不开心，无论是否五音不全，只要勇敢的唱，唱的嘹亮，自己收获的是那份快乐！
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