chaffer extension

例句：

1. 1. The farmer used a tractor to extend the length of his field.
   农民使用拖拉机来延长他的田地长度。
2. 2. The tractor's chaffer extension was damaged during the storm.
   拖拉机的收割机延伸部分在暴风雨中受损。
3. 3. The farmer had to repair the chaffer extension before harvesting the crops.
   农民在收割庄稼之前不得不修理收割机延伸部分。