求翻译：以珠三角、北京、天津为中心，立足下游建网络， 业务辐射广东、江西、福建、广西等地，横跨华北、东北地区，并逐步向我国西部地区延伸。是什么意思？

The Pearl River Delta, Beijing, Tianjin as the center, build networks based on the downstream, a business covering Guangdong, Jiangxi, Fujian, Guangxi, across the north, northeast, and gradually extended to the western region of China.

Point 3 in the Pearl River Delta, Beijing, Tianjin, base ourselves on downstream network, operational radiation Guangdong, Jiangxi, Fujian, Guangxi, and other places across North China, northeast China, and are gradually extending to the western parts of China.

Take the bead triangle, Beijing, Tianjin as the center, the foothold downstream construct the network, the service radiate places such as Guangdong, Jiangxi, Fujian, Guangxi, stretches across North China, the northeast area, and the western area extends gradually to our country.

To the Pearl River Delta, centered on Beijing, Tianjin, based on the lower building network, business radiation in Guangdong, Jiangxi, Fujian, Guangxi, and other places across the North, Northeast, and gradually extending to the western regions of China.

To the Pearl River Delta, centered on Beijing, Tianjin, based on the lower building network, business radiation in Guangdong, Jiangxi, Fujian, Guangxi, and other places across the North, Northeast, and gradually extending to the western regions of China.