1927 After the "April 12th" coup, Chiang Kai-shek began to slaughter * * * producers and revolutionaries. At this time, the motherland is in danger. Zheng Zhenduo and others jointly wrote a letter to mobilize Cai Yuanpei and other Kuomintang elders to stop Chiang Kai-shek's massacre, which annoyed Chiang Kai-shek. In order to avoid the persecution of the Kuomintang, he had to leave his motherland for Paris for a while. Just as he left the motherland (three days after boarding the ship), he wrote