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.
郑慧莹，李建东。 1999 。松嫩平原盐生植被与盐堿化草地恢复。科学出版社，北京。
Zheng huiying & li jiandong. 1999. the saline vegetation and its restoration on the songnen plains. science press, beijing.
郑慧莹，李建东。 1999 。松嫩平原盐生植被与盐堿化草地恢复。科学出版社，北京。
Zheng huiying & li jiandong. 1999. the saline vegetation and its restoration on the songnen plains. science press, beijing.
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