求是网评论员：

　　作者：求是网评论员
　　在中国河北省最北部、内蒙古高原浑善达克沙地南缘，横亘着一片浩瀚的万顷林海——塞罕坝机械林场。这里茂盛生长着世界上面积最大的一片人工林，春有群山抹绿，夏有林海滴翠，秋有层林尽染，冬有银装素裹，被誉为“河的源头、云的故乡、花的世界、林的海洋、鸟的天堂”。塞罕坝正如其蒙汉合...

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