What was the process of Zheng Xuan's career?

One? original text

Zheng Xuan was under Ma Rong's door and could not meet for three years. He was only taught by his high-impedance disciples. Disciples cannot understand the difference between heaven and earth. Or those who say that they are mysterious and capable, they will be called to calculate, and they will be sure in one turn. And Michelle Ye resigned, sighing that "rites and music are all in the east", fearing that Michelle Ye would be famous and jealous; Xuan also suspected that there were pursuers, but he sat under the bridge and was on the water. Melt the fruits one by one and tell the left and right: "If you declare on the ground and under the water, you will die." After the chase, Xuan survived. (In the fourth article of Shi Shuo Xin Yu, rites and music are all east)

Second translation

Zheng Xuan studied under Ma Rong at that time, and he hasn't seen Ma Rong for three years. I only taught Ma Rong's great-grandfather. (Ma Rong) Using the armillary sphere to calculate the position of celestial bodies is not allowed. None of the disciples can work it out. Some people say that Zheng Xuan can solve this problem, so Ma Rong looked for Zheng Xuan to calculate, and Zheng Xuan got the result. Everyone was amazed and admired. Later, when Zheng Xuan learned that he had left, Ma Rong lamented that "music and rites have gone east with Zheng Xuan". Ma Rong is worried that Zheng Xuan's reputation will surpass his own, and he is very jealous. Zheng Xuan also suspected that they would kill him, so he sat under the bridge and stepped on the water with clogs on his feet. As expected, Ma Rong is turning the steering wheel to predict his whereabouts. He said to the people around him: "Zheng Xuan is now lying on the ground, stepping on wood, which is a sign of certain death." So he stopped chasing, and Zheng Xuan finally survived.