一级理论和二级理论的区别

When Ji Feng opened his eyes, it was already the morning of the next day. This was the first time since he met Zhinao that he got up later than six o'clock. Even during the summer vacation, Ji Feng got up at around five o'clock every morning. On the one hand, he was short of food, and on the other hand, it was a habit he had developed throughout his senior year of high school....