升级现有建筑：10种表达方式

有几种方式可以表达将会对现有建筑进行升级：

1. Upgrade existing buildings
2. Renovate existing buildings
3. Modernize existing buildings
4. Improve existing buildings
5. Enhance existing buildings
6. Revamp existing buildings
7. Refurbish existing buildings
8. Retrofit existing buildings
9. Transform existing buildings
10. Redevelop existing buildings