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Cheng also participated in writing China's first academic document for atomic bomb research and experiments, designing a plan for setting off an atomic bomb at an iron tower higher than 100 meters, and planning the missions and formation of the institute of nuclear weapons experiments.

However, the difficulties and challenges such as the increasing pressure on a downward economy should not be neglected, he said.

"This sends a signal: the disciplinary as well as the political and legal systems are not a sanctuary [in China's anti-corruption campaign]," said Xin Ming, a professor with the Party School of the CPC Central Committee.

Burns arrived in Beijing on Tuesday on the second leg of his three-nation tour after a stop in the Republic of Korea. He will travel to Japan later on Thursday.

The flight was carrying 12 crew members and 227 passengers, including 154 Chinese.