短语词组短语degraded chernozem [土壤]退化黑钙土;变质黑土;变质黑钙土degraded ecosystem 生态系统degraded mountains 残余山degraded band 递降谱带;递降的degraded color 递减色;递降色degraded signal 恶化信号;恶化的信号degraded solonetz 退化碱土 返回 degraded