A central ring creates an ovular oculus which is the center-point of the space.

一中心环状横梁在间的中央建造了一圆形舞台。

The feature of ovular uterine bleeding disorder is regular menstrual cycle with short cycle, abnormal heavy menstruation, longer period but self ceasing.

有排子宫异常出血月经周期相对有规律，现为周期缩短、经量异常增多、经期较长但能自止。