solid barrel arch 实体拱

inclined barrel arch 斜拱筒

solid-barrel arch 实心板拱

skew-barrel arch 斜筒形拱 ; 斜圆筒形拱

skew barrel arch 斜筒形拱

skew- barrel arch 斜筒形拱

Multispan barrel arch 拱桥

solid barrel arch WESTBANK 实体拱

arch barrel 拱筒 ; 拱形筒壳