HSK 7-9
慢性
mànxìng形
slow and patient; chronic (disease); slow to take effect (e.g. a slow poison)
他因慢性腰痛接受长期治疗。
Tā yīn mànxìng yāotòng jiēshòu chángqī zhìliáo.
He is receiving long-term treatment for chronic lower back pain.
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Appears across levels (7-9) in the HSK 3.0 word list.