土地石漠化是环境恶化的生态标志，亦是国土资源开发整治的重要内容。

Stone desertion is one of the most serious crises among the environmental problems in the world, and it also becomes the zoology symbol of the environmental depravation.

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土地石漠化是环境恶化的生态标志，亦是国土资源开发整治的重要内容。

Rocky desertification is also one of the most serious crises among the environmental problems in the world, and it also becomes the zoology symbol of the environmental depravation.

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这正是大自然为什么让一些雄鸟长着充满异国情调的羽毛或让麋鹿拥有大而笨重的鹿角(这也是一个生态系统健康的标志)的原因之一。

This is one of the reasons why some males birds have exotic plumes, why elk carry hefty antlers (a sign of a healthy immune system), and why male fiddler crabs have such large claws.

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