绿地变成沙漠。
Some forests are so badly damaged that they become deserts.
一些森林遭到了严重的破坏，变成了沙漠。
Become deserts. Dunhuang in China, deep in the heart of the Gebi desert.
中国的敦煌，现在深深陷入戈壁滩的腹地。
Some places on the Earth don't get much rain. But they still don't become deserts.
虽然地球上一些地方很少下雨，然而它们并没有变成沙漠。
Many areas would become deserts and many animals would lose their homes and maybe die out.
许多地区将变成沙漠，许多动物将失去家园，甚至灭绝。
Many parts of the world, which once had large populations and produced plenty of crops have become deserts.
世界上的许多地区曾经人口众多，五谷丰登，而今却成了沙漠。
The area of desert in the world is growing every year. Many parts of the world which once had large populations and produced plenty of crops, have become deserts.
世界上沙漠的面积每年都在扩大，许多地区曾经人口众多，五谷丰登，而今却成了沙漠。
The area of desert in the world is growing every year. Many parts of the world, which once had large populations and produced plenty of crops, have become deserts.
世界上沙漠的面积每年都在扩大，许多地区曾经人口众多，五谷丰登，而今却成了沙漠。
At night, deserts can become very cold.
到了晚上，沙漠会变得非常冷。
That continuity of moisture is what brittle landscapes like deserts need to become fertile again.
这种持续的潮湿可以让沙漠这种容易恶化的地代再次变成富饶的土地。
That continuity of moisture is what brittle landscapes like deserts need to become fertile again. Water activates a mineralization process, setting free nutrients in the soil so that life can grow.
源源不断的水分供应可以让脆弱的地域（例如沙漠）重新变得肥沃，与此同时，水激活了土壤中的矿物质作用，让土壤中的营养物质释放出来，生命得以生长。
Their lives could have become great oases, but they remain deserts.
他们的生命本可以成为大大的绿洲，但是他们停留为沙漠。
Their lives could have become great oases, but they remain deserts.
他们的生命本可以成为大大的绿洲，但是他们停留为沙漠。
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