combination string

例句：

1. 1. The combination string is a sequence of characters that is used to represent a single value in a database.
   组合字符串是用于表示数据库中单个值的字符序列。
2. 2.In programming, the combination string is often used to concatenate strings together.
   在编程中，组合字符串通常用于将字符串连接在一起。
3. 3. The combination string is a common technique for managing large amounts of data in a database.
   组合字符串是一种常见的技术，用于管理数据库中的大量数据。