1. 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。
2. Global heating and environmental degradation are not technological problems. 全球变暖和环境退化不是技术问题。
3. 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。
4. 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。
5. Indeed, most analysts believe that some kind of environmental degradation underlies the demise of many extinct salmon populations. 事实上，大多数分析家认为某种环境退化是许多已灭绝鲑鱼种群消亡的根源。
