trefoil

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

平英国装饰风格棂条窗花格以圆圈、拱形、三叶形和四叶形为基础,形成网状图案。

2.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.

方法前唇设计出三叶瓣后,先对移位组织全游离及复位,再将三叶瓣向鼻小柱方向掀起,延长鼻小柱及抬高鼻底。