Plant cover is one of the most important sign of oasis ecological environment change.
植被覆盖度是绿洲生态环境变化的最重要标志之一。
The first step to change the economic condition is to improve the fragile ecological environment.
要改变陕北经济落后的现状，首先要改变陕北脆弱的生态环境。
The first step to change the economic condition is to improve the fragile ecological environment.
要改变陕北经济落后的现状，首先要改变陕北脆弱的生态环境。
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