level crossing gate

例句：

1. 1.The level crossing gate is a crucial part of the traffic system.
   水平交叉门是交通系统的关键部分。
2. 2. The level crossing gate was designed to prevent accidents on the busy road.
   水平交叉门被设计来防止繁忙道路上的事故。
3. 3. The level crossing gate is used to control the flow of vehicles at intersections.
   水平交叉门用于控制交叉路口车辆的流动。