beater shaft

例句：

1. 1.The farmer used a beater shaft to crush the grains for making flour.
   农民使用打谷机轴来碾碎谷物制作面粉。
2. 2. The machine's beater shaft was damaged during the accident.
   机器在事故中损坏了打谷机轴。
3. 3.The engineer replaced the beater shaft with a new one to improve efficiency.
   工程师用一个新的打谷机轴替换了旧的，以提高效率。