n.退化；降格，降级；堕落
degradations───n.[生物]退化（degradation复数）
degradational───免职的
defraudation───n.骗取钱财
disgradation───分级
aggradation───n.沉积
degradative───adj.使下降的；趋向下降的
depredation───n.掠夺；破坏，破坏痕迹
gradation───n.（色彩、颜色、次序、音调等的）渐变；分等级；（各种状态、性质等的）分阶段渐变；元音交替
upgradation───n.升级，更新，提高
Increases in seeds from pioneer plants and systematic changes in the animals hunted are evidence of environmental degradation.───先锋植物种子的增加和被猎杀动物的系统性变化是环境退化的证据。
Rallies all over the United States were organized to protest environmental degradation.───在美国，人们组织了很多集会，以抗议环境恶化。
They were sickened by the scenes of misery and degradation they found.───他们对所看到的凄惨和堕落景象感到恶心。
Heathcliff bore his degradation pretty well at first, because Cathy taught him what she learnt, and worked or played with him in the fields.───起初这孩子还很能忍受他的降级，因为凯蒂把她所学的都教给他，还陪他在地里干活或玩耍。
Due to the fact that there are multiple hops to get to the target database, it is possible that there might be some performance degradation.───由于到达目标数据库之前有多个跃点（hop），所以性能可能会有一些下降。
Historical lessons tell us that environmental degradation has always been a factor in social collapses.───历史教训告诉我们，环境恶化总是文明崩溃的一个前提。
He said the hydro-electric project has caused conflicts over land shortages and environmental degradation caused by irrational development.───他说，三峡水电站工程导致了土地缺乏的冲突矛盾和不合理开发造成的生态退化。
The simulational results also show that the degradation of gain induced by surface effects can be slowed down in a gradual base structure.───模拟还表明基区缓变结构可以减少表面复合，提高电流增益。
He says there is an over-emphasis on climate change as the only form of environmental degradation that poses challenges to the planet.───他称如今有一种把气候变化作为环境退化唯一方式而过分强调的趋势。环境退化对我们的星球提出了挑战。