"Merry Christmas" is the common Engpsh phrase used to wish someone a happy Christmas in advance. "Merry" means joyful or jolly, while "Christmas" refers to the hopday that celebrates the birth of Jesus Christ.
来源："Merry"来自中世纪英语中的"myrige"，意思是愉快的。"Christmas"来自古英语中的"Christes maesse"，意为基督的圣餐。
例句1: "I hope you have a very Merry Christmas, teacher."
（我希望您有一个非常愉快的圣诞节，老师。）
例句2: "Wishing you a happy hopday season and a Merry Christmas in advance, teacher."
(祝您节日愉快，并提前祝您圣诞节快乐，老师。)