The region, shaped like an inverted cone, in which the water table is drawn down, or depressed, in the vicinity of a borehole from which groundwater is being abstracted by pumping.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。