When I'm happy, I often sing out to share my happiness with others.
我高兴的时候，我常常唱出来与大家分享我的快乐。
Hand in hand, they returned to the stage to sing. Now every day the forest is filled with happy songs.
他们手牵手回到舞台上唱歌，让森林里天天都响起快乐的歌声。
During the party, we'll sing "Happy Birthday" to him with the candle on.
聚会时，我们会用蜡烛为他唱“生日快乐”。
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