Idiom: 1. To add unnecessary trouble or difficulty to an unnecessary action or practice. 2. Selling dog meat under the guise of sheep's head: It is a metaphor for showing off something high-end on the surface, but in fact, it is not really needed. 3. Wine is not afraid of the deep alley: the analogy is that the product quality is good and does not need publicity to find users. The image of a snake in a cup: It is a metaphor for imagining something illusory because of fear to describe the fear and uneasiness in people's hearts. 5. Beat the grass and alert the snake: This is a metaphor for beating the grass and alerting the snake before taking action, causing unnecessary vigilance or interference. The classical Chinese sentence: Turning hostility into friendship: a metaphor for turning conflict into peace and struggle into cooperation. A word spoken is as unchangeable as a promise made. 3. Learning from the mistakes of the predecessors: It is a metaphor for the failure of the predecessors to provide lessons for future generations. 4 Perseverance: It is a metaphor for perseverance, perseverance, and continuous hard work. 5. Pointing at the mulberry and scolding the locust tree: On the surface, scolding this person is actually scolding that person with the main purpose of changing the topic.