HSK 7-9
坚信
jiānxìn动
to believe firmly; without any doubt
她坚信努力终会带来改变。
Tā jiān xìn nǔ lì zhōng huì dài lái gǎi biàn.
She firmly believes that effort will eventually bring change.
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Appears across levels (7-9) in the HSK 3.0 word list.