HSK 7-9
老化
lǎohuà动
(of a person, population or material) to age; (of knowledge) to become outdated
这批电线已经严重老化。
Zhè pī diànxiàn yǐjīng yánzhòng lǎohuà.
This batch of wiring has aged badly.
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Appears across levels (7-9) in the HSK 3.0 word list.