What does the nickname "Zubo Sifu" mean?

The Fourth Hospital is also called the Upper and Lower Fourth Hospital, namely Fuzhou House (now Fuzhou City), Xinghua House (now Xianyou County, Putian City), Quanzhou House (now Quanzhou City) and Zhangzhou House (now Zhangzhou City).

The last four states are Tingzhou (now Changting), Yanping (now Nanping), Shaowu (now Shaowu) and Jianning (now Jian 'ou).

The upper and lower four hospitals add up to * * * eight hospitals, which are called Eight Fujian. Its origin is because Fujian Province was divided into eight prefectures in the Ming Dynasty.