After reserving water, the Three Gorges reservoir is facing more serious threat to water quality and ecological environment security. 摘要三峽大壩蓄水后水質(zhì)和生態(tài)環(huán)境安全的威脅加大。
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. 摘要土壤是農業(yè)生產(chǎn)的基礎，是人類(lèi)賴(lài)以生存的基石，也是人類(lèi)食物與生態(tài)環(huán)境安全的保障。
