I hope you have a very happy birthday, dad.
愿您有一个很愉快的生日，爸爸。
The cake had 'Happy Birthday' piped on it.
蛋糕上裱了“生日快乐”的字样。
I wished her a happy birthday.
我祝她生日快乐。
We all crowded into her office to sing 'Happy Birthday'.
我们全都涌进她的'办公室，唱“祝你生日快乐”。
He piped "happy birthday" on the cake.
他在蛋糕上镶上了“生日快乐”的字样。