sentences:  Xu Youyu
  
  Xu Youyu (, born 1947 in Chengdu) is a Chinese scholar in philosophy, a public intellectual, and a proponent of Chinese liberalism.Xu was a teenage Red Guard at the time of the Cultural Revolution, He was a researcher at the Chinese Academy of Social Sciences at the time of the Tiananmen massacre in 1989, and he tried in vain to persuade students to leave Tiananmen Square before the army suppression, as they refused to believe the soldiers would open fire on peaceful student protesters.