double-leaf bascule bridge的意思|示意

美 / / 英 / /

双翼竖旋桥

双叶竖旋桥 ... leaf bascule bridge 单叶竖旋桥 ; 双叶竖旋桥 double-leaf bascule bridge 双叶竖旋桥 single-leaf bascule bridge 单叶竖旋桥 ...