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第三人称单数：数：downgrades
过去分词：downgraded
过去式：downgraded
1. 下坡：downgrade flow自流 | downgrading下坡 | downhill direction减小方向
2. 降格;(結構地位)降級;降調：doublet 同源詞;雙式詞;同源異形詞 | downgrading 降格;(結構地位)降級;降調 | downtoner 減弱詞
3. 品位降低：downgrade 低质量 降低等级 | downgrading 品位降低 | downhair 绒毛