看了这篇文章的题目，读者可能会认为这是篇介绍饭店餐馆的文章。然而，这里写的却不是某某餐馆饭店的名号，而是本世纪那个风雷激荡的20年代，中国共产党在上海的3个秘密工作的机关代号。这3个秘密机关，所设的地点、所担负的功能、以及密级程度、开放范围都不相同，反映了城 Read the title of this article, readers may think this is an article introducing restaurant restaurants. However, what I wrote here is not the name of a certain restaurant or restaurant, but the name of the restaurant and restaurant in this century, but the name of the three secrets of the Communist Party of China in Shanghai in the 1920s when the stormy conditions prevailed. The three secret agencies, the location, the functions to be undertaken, and the level of secrecy and openness are all different, reflecting the city