Ding Zhaozhong is a well-known Chinese-American physicist. He gave a keynote speech at the High Energy Forum of the Chinese Academy of Sciences.

He said that the first experiment was the experiment of measuring positron and negative electron pairs in Germany. The second experiment was in the 20s of the 70th century, to do a series of experiments to measure photons and heavy photons. The fifth experiment, aimed at studying the origins of the universe, was the LEP colliding accelerator from 2003 to 3.