97 years ago today, April 14, 1928 (February 24, 1928, the lunar calendar), the first person to expose Japan's ambition to invade China. Cai Zhikan, a native of Miaoli, Taiwan. In April 1928, Cai Zhikan, a native of Miaoli, Taiwan, went to Japan as a supplementary book worker to work on sorting out imperial palace books. During work, I discovered and secretly copied the summary document of the "Eastern Conference", namely Tanaka's Memorial. This document proposes that if you want to conquer the world, you must first conquer China; if you want to conquer China, you must first conquer Manchuria. They were sent back to China several times and handed over to Zhang Xueliang for submission to the National Government, which was the first to expose Japan's ambition to invade China.