在河南农村长大的郑慧中，曾经因父亲拥有一辆三轮农用拖拉机感到自豪。
When Zheng Huizhong was growing up in the Henan countryside, he was proud his father owned a three-wheeled farm tractor.
拖拉机设计的主要改变包括有动力输出装置，以及多用式或三轮型拖拉机的出现，这使农户实现机械化培育作物；
Major changes in tractor design include the power takeoff, the all-purpose or tricycle-type tractor, which enabled farmers to cultivate planted crops mechanically;
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