"Orange gives birth to Huainan" is an idiom from Ten Miscellaneous Biographies of Yanzi Chunqiu: "Babies smell it: orange gives birth to Huainan and bitter orange gives birth to Huaibei. The leaves are similar to the disciples, but the taste is actually different. What's that? The soil and water are different. " Yan Zi said, "It is said that tangerine peel grows in the south of Huaihe River, and bitter orange grows in the north of Huaihe River, which has turned into bitter citrus reticulata. They only have similar leaves, but the fruit tastes different. Why is this happening? Because the water and soil are different.
Yan Zi uses natural phenomena as a metaphor for social phenomena, which shows that bad environment has an important influence on the growth and development of individuals, and sometimes external factors can completely change the essence of individuals under certain conditions.