生日快乐的英文为:happy birthday 例句: 1.蛋糕上裱了“生日快乐”的字样。 The cake had'Happy Birthday'piped on it. 2.我祝她生日快乐。 I wished her a happy birthday. 3.我们全都涌进她的办公室,唱“祝你生日快乐”。 We all crowded into her office to sing'Happy Birthday'. 4.妈妈,生日快乐! Happy Birthday,Mum. 5.生日快乐,亲爱的。 Happy birthday,swe