combine harvester thresher

例句：

1. 1. The combine harvester is a machine that can harvest crops in large fields.
   联合收割机是一种可以在大片田地中收割作物的机器。
2. 2. The farmer used the combine harvester to cut down the trees and collect the wood.
   农民使用联合收割机来砍倒树木并收集木材。
3. 3. The combine harvester has greatly improved the efficiency of crop harvesting.
   联合收割机大大提高了农作物收割的效率。