垸，有两个读音：①yuàn②huán，在中国湖南、湖北两省指在湖泊地带挡水的堤圩，亦指堤所围住的地区。
平垸行洪、退田还湖是鄱阳湖防洪保安的一项重要措施。
Pushing over the embankments and returning grain fields to the lake is an important measurement for the flood control of Poyang lake.
目的探讨退田还湖前后集成垸试点植被类型的变化及植被类型与钉螺孳生地活螺密度之间的关系。
Objective to clarify the change of vegetation types and its relationship between the density of alive-snails in the areas of "breaking dikes or opening sluice for water store" in Jicheng.
分析在移民建镇规划中应注意的问题；介绍了武汉市双柳镇护龙垸古龙村移民重建规划的具体做法和特色。
The paper analyzes some important problems during the resettlement, and introduces the details and characters of Longwanggulong village, Shuanlie town, Wuhan.
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