What does it mean that the orange born in Huainan is an orange and the orange born in Huaibei is an orange?

"Oranges born in Huainan are oranges, and oranges born in Huaibei are bitter oranges" means that oranges in Huainan will become bitter oranges when transplanted to the north of Huaihe River. Metaphor environment has changed, and the nature of things has also changed.

"Oranges born in Huainan are oranges, and oranges born in Huaibei are oranges." This sentence comes from Yan Zi's Spring and Autumn Annals.

The specific original text is as follows:

Yan Zi came to Chu State. When Chu heard about this, he said to the people around him, "Yan Ying, a poet of the State of Qi, came today, and I want to humiliate him. Why? " The left and right sides said, "in order to come, I ask you to tie a man and walk over the king." The king said, "What is it?" Right: "Qi people are also." The king said, "Why do you want to sit down?" Said, "Sit down and steal." Yan Zizhi, the king of Chu, gave Yan Zi wine, and he drank it. Two officials tied a man to the king, and the king said, "Who was tied?" He said: "Qi people are also thieves. Qi Weiwang looked at Yan Zi and said, "Are Qi people good at stealing?" Yan Zi avoided the table and said, "Babies can smell it, but oranges born in Huainan are oranges, and oranges born in Huaibei are oranges." Leaves are very similar to disciples, but in fact they taste different. What's that? Soil and water are different. Now people's livelihood is better than Qi's, but they stole it when they went to Chu. If they have water and soil without Chu, people will be good at stealing. "Wang said with a smile," saints are not interested in happiness, but I am interested in disease. "

Translation:

Qi sent Yan Zi to Chu. After hearing the news, the King of Chu said, "Yan Ying is good at talking in Qi. Now that he has come, I want to humiliate him. What should I do? " People around me said, "When he arrives, I will bind a person to pass by you. You will say,' What does this person do?' I replied,' It belongs to Qi. You ask,' What crime have you committed?' I replied, "I committed theft." Humiliate him Yanzi came to Chu, and the king of Chu and Yanzi were drinking. When they were having fun, two officials led a tied man through the hall. The king of Chu deliberately asked, "What are people tied up for?" The official replied, "It's a Qi man who committed theft. The king of Chu looked at Yan Zi and said, "Are Qi people good at stealing?" Yan Zi left his seat and replied seriously, "I heard that oranges born in Huainan are oranges and oranges born in Huaibei are oranges, but their leaves are similar, but their fruits taste different." "Why did this happen? Because the water and soil are different. Now people grow up in the state of Qi and don't steal, but they steal when they enter Chu. It won't be the soil and water of Chu that makes people steal! " King Chu said with a smile, "A saint can't joke with him, but I'm asking for trouble by doing so.