fragile environment短语¹¹⁴⁴⁶⁷⁺⁴ 基本例句 🌏脆弱的环境；脆弱生态；脆弱环境 The charcoal concentration changes on the Yangjiawan palaeosol section and the ancient relics discovered near the section reflect the impacts of Human activities on the fragile environment. 鄂尔多斯杨家湾古土壤剖面的炭屑浓度变化、考古遗址的发现较好地反映了人类活动强度的变化。 cnki