情不自禁

Explanation: Ban: inhibition. Can not control the feelings of excitement. Stressed completely dominated by a feeling. 　　Usage: The main predicate; as predicate, adverbial; to describe people's feelings 　　Source: Southern Liang Liu compliance "Tanabata pinning" poem: "If you are interested further on, little to tempting." 　　Examples: She also ~ to burst into tears. (Sha Ting "autumn evening") Thesaurus:  cannot help laughing, be unable to stifle a laugh; can’ t help laughing, Renjunbuzhu, let loose a banquet of brine, tears and mucus flowing down rapidly, naturally, Spontaneously, quiet or partly suppressed laugh Antonym Group:  forced laughter, find happiness in suffering