国家加强对青藏高原退化草原、退化湿地、沙化土地治理和水土流失防治的力度，综合整治重度退化土地，加强对重要江河源头区和水土流失重点预防区、治理区以及人口相对密集高原河谷区的水土流失防治。
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There are 3 components to this project:，这一点在谷歌中也有详细论述
The MacBook Air’s speakers and webcam are also still excellent. Last year, Apple upgraded the 1080p webcam in the Air to a 12-megapixel Center Stage model that can follow your movements to keep you in frame or switch to a “desk view” that shows a top-down viewpoint of the area in front of the laptop. The old 1080p webcam was already pretty solid, and while this one doesn’t magically repair your wrinkles, it’s definitely more versatile and detailed. The speakers, meanwhile, remain one of those things that Apple has absolutely nailed with this generation of its laptops. They’re relatively loud and well-balanced, providing far better sound than I’d expect from such a thin enclosure.