基本解释[土木建筑工程]上开桥扇竖旋翅词组短语短语bascule leaf west bank 上开桥扇single leaf bascule bridge 单扇上开桥double -leaf bascule bridge 双叶竖旋桥leaf bascule bridge 双叶竖旋桥;单叶竖旋桥twin -leaf bascule bridge 双翼衡重式仰开桥专业释义土木建筑工程上开桥扇竖旋翅