１９１５年暑假，毛泽东向长沙各学校发出一则“征友启事”。大意是愿意和有爱国热情的青年结为朋友，愿意和那些不怕艰苦，不怕困难，能够为国为民献身的志士仁人通信联络。署名是“二十八面生”。“二十八画生”是什么意思？当时许当人都不理解。１９７２年尼克松访华的时候? In the summer of 1915, Mao Zedong sent a “Call for Friends” to all schools in Changsha. The effect is that we are willing to make friends with the young people who have the patriotic passion and are willing to liaise with those people who are not afraid of hardships, who are not afraid of difficulties and who can sacrifice their lives for the country. Signature is “twenty-eight noodles”. What does “twenty-eight paintings” mean? At that time when people do not understand. When Nixon visited China in 1972?