upgrade existing enterprises

• 改善现有企业

upgrade existing enterprises的用法和样例：

例句

1. We must give full scope to the production capacity of the existing enterprises.
   我们必须充分发挥现有企业的生产能力。
2. Foreign capital is mainly used in the key construction and in technology reformation of the existing enterprise.
   外资主要用于关键的建设项目和现有企业的技术改造。