plow bolt

例句：

1. 1. The farmer used a plow bolt to break the frozen ground.
   农民用犁头螺栓来打破冻土。
2. 2.The old plow bolt was rusted through, so it had to be replaced.
   旧的犁头螺栓生锈了，所以不得不更换。
3. 3. The farmer carefully tightened the plow bolts before starting the plowing.
   农民在开始耕作前仔细地拧紧犁头螺栓。