feed dial

例句：

1. 1. The farmer used a feed dialto control the feeding of his livestock.
   农民使用一个喂食器来控制他的家畜的喂养。
2. 2. The engineer designed anew feed dial that would improve efficiency.
   工程师设计了一个新的喂食器，以提高效率。
3. 3. The vet recommendeda special feed dial for thedog's health.
   兽医推荐了一个特殊的喂食器来照顾狗的健康。