不亦乐乎 bù yì lè hū Lit. 不 (“not”) + 亦 (“also&a

不亦乐乎 bù yì lè hūLit. 不 (“not”) + 亦 (“also”) + 乐 (“music”) + 乎 (classical “question”)Trans. to be extremely exuberant, exhilaration  -- source link

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