bridge opening mark

例句：

1. 1.The bridge opening mark is a crucial part of the bridge design.
   桥开口标记是桥梁设计中至关重要的一部分。
2. 2. The bridge opening mark was designed to prevent vehicles from colliding with each other.
   桥开口标记被设计来防止车辆相互碰撞。
3. 3. The bridge opening mark was carefully placed to ensure safe passage for pedestrians and cyclists.
   桥开口标记被仔细放置，以确保行人和自行车的安全通行。