The delta complex is composed of over100sedimentary units each of which can be divided into a plain facies and a frontier facies.
该三角洲复合体由100多个沉积单元组成。每一个扇三角洲单元，可分出平原相，前缘相。
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。
This paper presents the hydrologic network design and hydrometry method in the Pearl River Delta, which is very complex in drainage network.
水系复杂的珠江三角洲河网地区具有独特的水文站网布设及水文测验方法。
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