I know the truth hurts, but I still want to tell you a fact I have observed. In fact, the knowledge of many disciplines can be applied across fields, but most people cannot even flexibly apply that knowledge, including most college students from prestigious universities. Many people learn based on rote memorization, one question for one answer. If they change to another field, the principles are the same, but they just can't flexibly transfer what they have learned in other fields to other fields.