| 1 | Today, built-up area has been expanded to 369 square kilometers. | |
| 2 | Outside the city in a built-up area a fire blazed across several kilometres. | |
| 3 | It also concludes the problems existing in the expansion of built-up area and gives some reasonable suggestions. | |
| 4 | Conclusion The dose build-up regions have changed and surface dose increases considerably after the application of masks. | |
| 5 | The current situation of street trees in Xuchang built-up area was investigated, and the problems were analyzed. |
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