单词cattle grid
n.: 牛栏网络: 牛的；牛路坑
拦畜沟栅（铺在公路坑上的金属架，车辆可通过，但牛羊过不去）:
metal bars that are placed over a hole that has been made in the road. Cars can pass over the metal bars but animals such as sheep and cows cannot.
防畜栏
牛栏