trefoil

"The Bar tracery of the parallel English Decorated style formed netlike patterns Based on the circle, arch, trefoil, and quatrefoil."

平行英国装饰风格棂条窗花格以圆圈、拱形、叶形和四叶形为基础,形成网状图案。

Methods After designs the trefoil flap in the prolabium, the displaced tissuce is replaced and the columnella is lengthened, the sill is raised by the application of the trefoil flap.

方法前唇设计出叶瓣后,先对移位组织进行完全游离及复位,再将叶瓣向小柱方向掀起,小柱及抬高底。