Happybirthday是問候語嗎

不是問候語，是祝福語，例如：

1、The cake had 'Happy Birthday' piped on it.蛋糕上裱了“生日快樂”的字樣。

2、I wished her a happy birthday.我祝她生日快樂。

3、We all crowded into her office to sing 'Happy Birthday'.我們全都湧進她的辦公室，唱“祝你生日快樂”。