He piped "happy birthday" on the cake.

　　他在蛋糕上鑲上了“生日快樂”的字樣。

　　Happy Birthday All Year!

　　全年生日快樂！

　　Last Friday, after he arrived at the school, instead of finding garbage to clean up, he found almost 800 students lining the hallways with handmade cards, blowing noisemakers and singing a full-throated happy birthday to him ．

　　上周五,他來到學校后,發現沒有垃圾需要清理。他看到近800名學生在走廊里成隊列站著，他們拿著手工卡片,吹著擴音器,為他大聲唱著生日快樂歌。

　　In those days people sent birthday cards when they couldn't wish somebody a happy birthday in person ．

　　那時候，當人們不能親自祝某人生日快樂時，他們就會寄生日賀卡。

　　Do you know that the "Happy Birthday to You" song is the first song sung in outer space?

　　你知道"祝你生日快樂"這首歌是第一首在外太空被唱響的歌嗎？