(a) Their practice, bilateral or regional, relating to the allocation of groundwaters from transboundary aquifer systems and the management of non-renewable transboundary aquifer systems relating to the topic currently entitled "Shared natural resources";
(a) 在目前"共有自然资源"专题方面，关于跨界含水层系统地下水的分配以及关于不可再生跨界含水层系统的管理的双边或区域实践；