legacy systems

• 遗留系统

legacy systems的用法和样例：

例句

1. Ripplebase implements primitive journaling mechanisms to speed queries on slow systems, and is targetted at legacy systems.
   它实现了基本的日记机制来提高查询速度，它适用于遗留系统。
2. Legacy system reengineering has already been a very important branch of software engineering.
   遗留系统再工程已经成为软件工程领域一个重要分支。