ngǐ-huà硬化

to harden

to harden; to become hard; to become rigid or inflexible; sclerosis

pathology

English Wiktionary, “硬化” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E7%A1%AC%E5%8C%96 · confidence: Medium (Wiktionary, Hokkien)