1."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圈、拱、三和四基础,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.