下沉花园外缘环路与下行支径

提示词

生成下沉花园概念，让主环路沿上缘连续组织，少数下行支径按设定接入低处活动或观察点；主环、支径和种植坡面可分辨，不把路线画成没有接点的同心装饰线。

Create a sunken-garden concept with a continuous main loop along the rim and selected descending branches reaching lower activity or viewing points. Distinguish the loop, branches and planted slopes rather than drawing disconnected concentric decorative lines.