3. A mathematical model for groundwater pollution in a leaky aquifer system, which involves the adsorption of semipervious layer, is presented. �����һ��Խ����ˮ��ϵͳ������ˮ���������õĵ���ˮ��Ⱦ��ѧģ�͡�
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adj.
1. permitting the unwanted passage of fluids or gases
2. used informally; unable to retain urine
3. prone to communicate confidential information