After reserving water, the Three Gorges reservoir is facing more serious threat to water quality and ecological environment security. 摘要三峡大坝蓄水后水质和生态环境安全的威胁加大。
Soil is the base of agricultural production, the keystone that Man relies on for survival, and the guarantee of food and ecological environmental safety for human beings. 摘要土壤是农业生产的基础，是人类赖以生存的基石，也是人类食物与生态环境安全的保障。
