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。
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.
他们给我唱了生日歌， 妈妈给我做了一个大蛋糕，我把蛋糕切成小块，并分给了他们。
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