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    不可一世

    bùkěyīshì

    1. (idiom) to consider oneself unexcelled in the world; to be insufferably arrogant

    他年轻时不可一世,后来才明白自己有多渺小。 Tā niánqīng shí bùkěyīshì, hòulái cái míngbai zìjǐ yǒu duō miǎoxiǎo.