Yang Ping said, "What do you think this letter indicates?"
Zhaxi thought for a moment and said, "The person who wrote the letter knows something about Professor Zhou from thirty years ago, something that if exposed, would be very detrimental to him."
Yang Ping nodded, "Right, what is that matter?"
Zhaxi shook his head.
Yang Ping said, "Officer Yu found out that thirty years ago, Professor Zhou participated in a national research project named 'Development of a New Efficient Organic Phosphorous Pesticide.' This project was part of the country's 'Seventh Five-Year Plan' initiatives, and Professor Zhou was one of the main participants. The project eventually did not succeed and was terminated midway. But according to insiders, the reason for its termination was not technical issues but because the toxicity of one of the compounds was too high, making it unsuitable for use as a pesticide."
