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三北防护林工程自1978年启动实施至今已有30余载。截至2007年,工程已累计完成造林保存面积2446.9万公顷,工程区森林覆盖率由5.05%提高到10.51%,森林
The Three North Shelterbelt Project has been in operation for more than 30 years since its implementation in 1978. As of 2007, the project has accumulated a total of 24.469 million hectares of afforestation preservation area, the forest coverage rate in the project area increased from 5.05% to 10.51%, and the forest