sunk fence
柯林斯词典
1. N a ditch, one side of which is made into a retaining wall so as to enclose an area of land while remaining hidden in the total landscape 矮墙 (Also called ha-ha)
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1. N a ditch, one side of which is made into a retaining wall so as to enclose an area of land while remaining hidden in the total landscape 矮墙 (Also called ha-ha)