The Yellow River Delta experienced transgression and recession three times, so the formation and distribution of groundwater was complex.
黄河三角洲地区历经三次海侵和海退，地下水成因和赋存条件复杂。
The Yellow River Delta experienced transgression and recession three times, so the formation and distribution of groundwater was complex.
黄河三角洲地区历经三次海侵和海退，地下水成因和赋存条件复杂。
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