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。

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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。

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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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