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The development stage of adjacent diffusion and trans-regional diffusion
| Stage | TYPE of diffusion | |
|---|---|---|
| Adjacent diffusion | Cross-regional diffusion | |
| Stage 1 | Chongqing | Beijing, Guangzhou, Haikou, Zhuhai, Sanya |
| Stage 2 | Zhengzhou, Xinyang, Yangquan, Shangqiu | |
| Stage 3 | Ha’erbin, Tianjin | |
