.. 3 north shelter-forest is located in our country northward walnut the concentration of prepotent belt area.
【摘要】三北防护林地处我国北桃生带的集中区域。
.. 3 north shelter-forest is located in our country northward walnut the concentration of prepotent belt area.
【摘要】三北防护林地处我国北桃生带的集中区域。
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