圣诞快乐有很多种写法··给你例举一些常用的

Merry Christmas!

在贺卡中也有 happy christmas的写法··并不是一定要使用 merry christmas来表示圣诞快乐

Merry Christmas and Happy New Year!

May the joy and warmth of Christmas fill your home with happiness.

Wishing you the peace, joy and happiness of Christmas!

May peace and love be your gift at Christmas and always!