HSK 5
艰苦
jiānkǔ形
difficult; hard; arduous
他们在艰苦条件下完成工程。
Tā men zài jiān kǔ tiáo jiàn xià wán chéng gōng chéng.
They completed the project under difficult conditions.
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New in the HSK 3.0 word list at level 5.