最近，他完成了历时两年的关于采取跨国环境合作来阻止沙漠化并保护东北亚湿地的实地研究。
He recently completed two years of fieldwork on transnational environmental cooperation to prevent desertification and protect wetlands in Northeast Asia.
中国—东北亚国家之间的环境合作包括众多方面，既有双边合作，又有多边合作。
The cooperation in environment between China and Northeast Asian countries involves many aspects, with both bilateral cooperation and multi-lateral cooperation.
中国—东北亚国家之间的环境合作包括众多方面，既有双边合作，又有多边合作。
The cooperation in environment between China and Northeast Asian countries involves many aspects, with both bilateral cooperation and multi-lateral cooperation.
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