If you congratulate someone, you say something to show you are pleased that something nice has happened to them.
例句
She congratulated him on the birth of his son...她祝贺他喜得贵子。I was absolutely astonished by the reaction to our engagement. Everyone started congratulating us.大家对我们订婚的反应让我非常惊讶。所有人都开始祝贺我们。
VERB
表扬；称赞
If you congratulate someone, you praise them for something good that they have done.
例句
I really must congratulate the organisers for a well run and enjoyable event...活动安排得有条不紊，充满乐趣，我必须要称赞一下组织者。We specifically wanted to congratulate certain players.我们特别想表扬几名选手。
VERB
为(自己)感到高兴(或自豪）
If you congratulate yourself, you are pleased about something that you have done or that has happened to you.
例句
Waterstone has every reason to congratulate himself...沃特斯通完全有理由为自己感到高兴。Journalists have been congratulating themselves on the role the press has played in the investigations.记者们为新闻界在调查中所起的作用感到自豪。
英汉词典释义
vt.
向（某人）道贺；祝贺
He is to be congratulated for his success.他将会由于取得的成就而受到祝贺。
英英词典释义
Verb
1. say something to someone that expresses praise;
"He complimented her on her last physics paper"
2. express congratulations
3. be proud of;
"He prides himself on making it into law school"
4. pride or congratulate (oneself) for an achievement