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1、congratulation- the act of acknowledging that someone has an occasion for celebration - (usually plural) an expression of pleasure at the success or good fortune of another; "I sent them my sincere congratulations on their marriage" 上面是字典的解释，基本来说congratulation既可以表示祝贺的这个行为，也可以表示这些祝贺本身。

2、而前者不可数，用congratulation后者可数并通常以复数形式出现，为congratuations。

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