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劣化 (れっか) — deterioration (in quality, performance, etc.); degradation; worsening
劣化
れっか 
れ っ か
Noun (common) (futsuumeishi), noun or participle which takes the aux. verb suru, intransitive verb 
Full 
Deterioration (in quality, performance, etc.); degradation; worsening
人類
は
生態系
の
劣化
を
防
ぐことができるでしょうか
？
Will humanity be able to prevent the degradation of ecosystems?
Noun (common) (futsuumeishi), noun or participle which takes the aux. verb suru, intransitive verb, colloquialism (visible) aging; becoming unattractive (due to aging)
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Verb conjugation table 劣化
| Form name (形) | Word |
|---|---|
| Dictionary (辞書) | 劣化する/れっかする |
| Past (た) | 劣化した |
| Negation (未然) | 劣化しない |
| Polite (丁寧) | 劣化します |
| te (て) | 劣化して |
| Ability (可能) | 劣化できる |
| Passive (受身) | 劣化される |
| Command (使役) | 劣化させる |
| Passive command (使役受身) | 劣化させられる |
| Conditions (条件) | 劣化すれば |
| Command (命令) | 劣化しろ |
| Will (意向) | 劣化しよう |
| Prohibition (禁止) | 劣化するな |
れっか is used in practice
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