How to say "Christmas" in Chinese:

Sheng4 dan4 jie2

What are these numbers? 

Here are a few good combinations to commit to memory:

Sheng4 dan4 lao3 ren2 = Santa Claus
Sheng4 dan4 kuai4 le4 = Merry Christmas
Sheng4 dan4 shu4 = Christmas tree
Sheng4 dan4 wa4 = Christmas stocking
Pin2 gan1 ye4 = Christmas eve
Sheng4 dan4 li3 wu4 = Christmas gift