I want to offer my congratulation on your promotion.

我想对你的晋升表示祝贺。

He sent her a letter of congratulation on her passing the exam.

他给她寄去了贺信,祝贺她通过了考试.

He received as many as a hundred letters of congratulation on that single day.

在那一天之内他所收到的贺函多达一百封.