HSK 7-9
变故
biàngù名
an unforeseen event; accident; misfortune
家中突发变故他暂时请假。
Jiā zhōng tū fā biàn gù tā zàn shí qǐng jià.
He took temporary leave after an unforeseen event in his family.
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Appears across levels (7-9) in the HSK 3.0 word list.