英语语法分析

They were no longer using mules and horses to plough their fields.

他们那时已不再用骡子和马来犁地了。

《柯林斯英汉双解大词典》

Eventually, tractors began to replace mules, making them less in demand.

最终，拖拉机开始取代骡子，这让骡子的需求量减少了。

George Washington was the first person in the United States to own mules.

乔治·华盛顿是美国第一个拥有骡子的人。