All Celtic knot patterns are accurately drawn using a grid and all geometric elements of patterns are lines and arcs. 凱爾特結圖案 celtic knot、celtic knot patterns、celtic patterns、knot patterns、patterns 凱爾特結、凱爾特結圖案、凱爾特人的模式、結圖案、模式 資料來源:openclipart ( https://openclipart.org/ )