establishing a reliable database on the brain drain both to determine the magnitude of the problem, and to promote networking and collaboration between experts in the country and those in the diaspora
建立一个可靠的人才流失数据库，以确定问题的程度，并促进该国和散居海外的专家之间的网络和合作。
以上为机器翻译结果，长、整句建议使用 人工翻译 。