Therefore, river evolution has very vital initiative and promoting effects on the formation and development of sand-dune groups and sandy land in natural conditions.
这些足以说明，在自然状况下，河流演变在沙丘群和沙地形成演化中起着非常重要的促进作用。
The study on the headland-bay equilibrium shape rules is an important content which involves the stability and evolution of sandy coasts.
岬间海湾平面平衡形态规律的研究是砂质海岸稳定与演变研究的重要内容。
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