double leaf swing bridge 双翼平旋桥

single leaf bascule bridge 单扇上开桥

single-leaf swing bridge 单叶平转桥 ; 单叶平旋桥

leaf of bascule bridge 竖旋桥桥翼

single-leaf bascule bridge 单叶竖旋桥

double-leaf bascule bridge 双叶竖旋桥

leaf bascule bridge 单叶竖旋桥

leaf swing bridge 双叶平转桥

double-leaf swing bridge 双翼平旋桥