HSK 7-9
自强不息
zìqiáng-bùxīto strive unremittingly; self-improvement
自强不息的精神令人敬佩。
Zìqiángbùxī de jīngshén lìng rén jìngpèi.
The spirit of relentless self-improvement is admirable.
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Appears across levels (7-9) in the HSK 3.0 word list.