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vt. 降低, 贬低
n. 下坡
a. 下坡
adv. 下坡

n. the property possessed by a slope or surface that descends
v. rate lower; lower in value or esteem

过去分词: downgraded 过去式: downgraded 现在分词: downgrading 第三人称单数: downgrades 复数: downgrades