HSK 7-9
锲而不舍
qiè’érbùshěto chip away at a task and not abandon it (idiom); to chisel away at sth; to persevere; unflagging efforts
他凭着锲而不舍的精神成功了。
Tā píngzhe qiè'érbùshě de jīngshén chénggōng le.
He succeeded through unflagging perseverance.
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Appears across levels (7-9) in the HSK 3.0 word list.