Such as Qu Qiubai, Zhang Tailei, Zhou Youguang, Zhao Yuanren, Liu Guojun, Shi Liang, and so on. We visited Zhou Youguang Library and Shi Liang's former home. It worths tospend some time visiting them

我回来啦

知世故而不世故，善自嘲而不嘲人。