上海是中国工人阶级最集中的城市之一。中国共产党就是于20世纪初叶诞生在这座城市中的。在经过革命先辈半个多世纪的浴血奋战后，这座城市的很多地方都留存下他们当年战斗的遗迹旧址。今天，这些遗迹旧址不少已作为文物，被各级人民政府保护了起来，有的还建成了纪念馆，其文 Shanghai is one of the most concentrated cities in the working class in China. The Chinese Communist Party was born in the city at the beginning of the 20th century. After bloody battles by the revolutionary predecessors for more than half a century, many sites in the city have survived the sites of their relics of war. Today, many of these relics sites have been protected as cultural relics by people’s governments at all levels, and some have also built memorials.