北京平原造林工程实施成效总结与反思——以大兴区青云店平原造林工程为例
북경평원조림공정실시성효총결여반사——이대흥구청운점평원조림공정위례
The Summary and Reflection of Beijing's Plain Reforestation -- Taking Qingyundian of Daxing District as an Example