第三人称复数：grade crossings
1. 平面交叉, 平交道：unconditional jump 无条件转移 [自]无条件跳转 | grade crossing 平面交叉, 平交道 | deoxidized steel 脱氧钢
2. 平面交叉：grade correction ==> 坡度校正 | grade crossing ==> 平面交叉 | grade crossing predictor ==> 道口信号预报器
3. 平面交：grade compensation 纵坡折减 | grade crossing 平面交* | grade length limitation 坡长限制
noun
1. intersection of a railway and a road on the same level
barriers close road when trains pass
Synonym: level crossing