HSK 7-9
磨炼
móliàn动
to temper oneself; to steel oneself; self-discipline; endurance; variant of 磨练
艰苦训练磨炼了他的意志。
Jiānkǔ xùnliàn móliàn le tā de yìzhì.
The tough training tempered his will.
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Appears across levels (7-9) in the HSK 3.0 word list.