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。