n.降格；墮落；退化

Slow degradation of ground water quality may result from repeated use. 循環(huán)使用地下水可以導(dǎo)致緩慢的水質(zhì)降低。

Gambling is always coupled with degradation . 賭博總是與墮落相聯(lián)系。

Environmental degradation is a global issue of common concern to the international community today. 環(huán)境惡化是當(dāng)今國(guó)際社會(huì)普遍關(guān)注的全球性問題。

He lives in utter degradation. 他生活十分潦倒。

n.生物降解