劣化， れっか

1. deterioration (in quality, performance, etc.), degradation, worsening 2. (visible) aging, becoming unattractive (due to aging)

劣化，恶化；老化

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音读: レツ  

训读:おと.る  

日检:1 grade:8 笔画数:6 部首:19

音读: ケ   カ  

训读:ば.かす  ば.ける  け.する  ふ.ける  

日检:2 grade:3 笔画数:4 部首:21