bulling bar

例句：

1. 1.The farmer had to repair the bulling bar after a storm damaged it.
   农民在暴风雨后不得不修理牛栏栅栏。
2. 2.The bulling bar is an essential part of the farm's infrastructure.
   牛栏栅栏是农场基础设施的重要组成部分。
3. 3. The bulling bar was old and in need of replacement.
   牛栏栅栏旧了，需要更换。