I hope you have a very happy birthday, dad.

　　愿您有一個很愉快的生日，爸爸。

　　The cake had 'Happy Birthday' piped on it.

　　蛋糕上裱了“生日快樂”的字樣。

　　I wished her a happy birthday.

　　我祝她生日快樂。

　　We all crowded into her office to sing 'Happy Birthday'.

　　我們全都涌進她的辦公室，唱“祝你生日快樂”。

　　He piped "happy birthday" on the cake.

　　他在蛋糕上鑲上了“生日快樂”的字樣。