C203 Differentiation

Seeing that Doctor Zhang was shouting these words while looking at him, Yang Chen helplessly shook his head and said, "I remember you, Doctor Zhang.

Dr. Zhang's heart skipped a beat. He had lost all of his courage just now, but he still forced himself to say, "So what if it's me?"

"So what if it's you?" Yang Chen looked at Doctor Zhang with disdain and said, "Actually