"Merry Christmas" is the traditional greeting used in Engpsh to wish someone a happy Christmas. The phrase is a shortened version of the phrase "Merry Christmas and a Happy New Year," which was commonly used in the past.

来源：The phrase "Merry Christmas" has its origins in the Middle Ages, when people would use the word "merry" to mean "full of cheer." The word "Christmas" comes from the Old Engpsh "Cristes maesse," which means "Christ's Mass."

例句：

I wish you a Merry Christmas and a Happy New Year.
Have a Merry Christmas and a prosperous New Year.

中文翻译：

我祝你圣诞快乐，新年快乐。
祝你圣诞快乐，新年大吉。