investment base

例句：

1. 1.The company's investment base is expanding rapidly in the new technology sector.
   该公司的投资基础正在迅速扩展到新技术领域。
2. 2. The government has invested heavily in infrastructure development to boost economic growth.
   政府已经大量投资于基础设施建设，以促进经济增长。
3. 3. The investment base is a critical factor in determining the success of a project.
   投资基础是决定项目成功的关键因素。