扇形饰边 scalloping
用扇形饰边装饰 decorate with scallops
扇形装饰 saclloped trimming
形后背扇贝饰边 shaped back scallop trim
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尤其是指与英国垂直式风格有关的一种扇形拱顶的交叉拱肋在接合点的拉长浮凸饰（雕刻的楔石）。
Especially an elongated boss (carved keystone) at the junction of the intersecting ribs of the fan vaulting associated with the English Perpendicular style.
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