fairy ring

fairy-ring的词性：
n.（名词）

1. A circle of mushrooms in a grassy area, marking the periphery of perennial underground mycelial growth.
蘑菇圈：多草区域的菌环，其特点为其直径亦年年增大

fairy-ring的词源：

2. [From the belief that it is a dancing place for fairies]
[据说是仙女们跳舞的地方]