桥建筑限界的英文：
clearance above bridge floor
n. 清除，清扫；清仓甩卖；空隙；放行证
take off clearance = clearance for take off
起飞许可
The plane was given clearance to land.
飞机被给予着陆的许可。
Clearance of this check could take a week.
支票兑现可能需要一个星期。
n. 桥，鼻梁，琴马，桥梁，电桥，下隔板，桥牌
v. 架桥于，用桥连结，跨越，横贯，
removable bridge
可移动齿桥
immediate bridge
立即齿桥
They are engineering a bridge.
他们正在建造一座桥。
n. 地板，地面；基底；议员席；楼层
v. 铺地板；打倒；难倒
floor of the House
英国议会中议员的座席|议员席
floor criterion
最低额标准
The meeting room is in the third floor, sorry, the fourth floor.
会议室在三楼，抱歉，是四楼。