Today, 85 years ago, on July 3rd, 1940 (March 28th, 1940), the "Seven and Three Forces" campaign against China. The Japanese 7th and Three Forces captain Yoshino developed a bomb that could spread the plague. In July 1940, the Japanese "Seven and Three Forces" captain Yoshino invaded China, leading an expedition, carrying 70 kilograms of cold virus, 50 kilograms of cholera virus and 5 kilograms of infected mosquito virus and launched a bacterial battle in the Ningbo area in China. The Japanese Army carried the bacteria into the pool and residential area, causing the infection of a mosquito epidemic. At the same time, the Japanese "Seven and Three Forces" expedition in Nanjing "Hong Kong"