Canon is a music composition technique. The first melody is the introduction, and the later imitations are the answers.
Canon's name was first pronounced as "caccia" and in Old French as "clnon", which means dependence.
When the answer sentence is wrong, this dependence relationship will be broken, and the introduction sentence will also be in crisis.
Duan Chengyu was once Li Xiuzheng's support, and then Li Xiuzheng became his support.
Later, they relied on each other, or in other words, they relied on each other from the beginning.
A cold and taciturn entrepreneur x a pianist with low self-esteem
At the age of two, Li Xiuzheng was 30 years old and Duan Chengyu was 28 years old.
Concept: Counterpoint, note against note.