分析了林、草在沙区生态环境中的作用及如何进行还林还草；
Then, the action of restoring forest or grass and its method are analysised.
历史上的海河流域山区曾经草深林密。
In the history, the mountain area of the Haihe River valley was a dense forest.
历史上的海河流域山区曾经草深林密。
In the history, the mountain area of the Haihe River valley was a dense forest.
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