"I'm going crazy with joy" belongs to the description of expression and action. When describing, you should use words to express and express. Action description is to write the action behavior of characters, which is dynamic. Expression description focuses on the facial expressions of characters and is static.

Action description focuses on accurately and vividly expressing the dynamics of characters, while portraits, expressions and other descriptions mainly depict the static characteristics of characters. If we can flexibly use a variety of descriptive techniques, achieve dynamic and static contrast, and show dynamic with static, the characters can truly achieve the situation of "more and more vivid and more real".

The expression description is characterized by the nuanced expression of characters, which allows readers to imagine the psychological and emotional performance of the protagonist and vivid images.