degradev.降格；使屈辱；贬低；退化；降解degraded primary beam减量原射线degraded forest types退化类型degraded hemicellulose半纤维素降解糖degraded mountain area退化山地degraded service state降级服务状态Degraded mountain land退化山地degraded shell element实体退化壳单元Degraded alpine meadow高寒退化草地degraded relay channel降质中继信道degraded karst forests退化喀斯特森林