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A trefoil arch -- or three-foiled cusped arch -- is an arch incorporating the shape or outline of a trefoil — three overlapping rings. It has been widely used for its symbolic significance in Christian architecture. 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Trefoil arch」の詳細全文を読む スポンサード リンク
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