护拦的英文：
rail

Please do not park in front of the Barrier
请不要在护拦前停车

To supply or enclose with rails or a rail.
用栏杆围提供栏杆或把栏杆围起来

The coal will be shipped by rail.
这些煤将用火车装运。

Trains run on rails.
火车在轨道上行驶。

Hold on to the rail or you'll slip!
抓住扶手，不然你会滑倒的。

Rust has corroded the steel rails.
锈侵蚀了钢轨。