CustomerService bean是个工具类，它实现了访问数据库以增加、更新、删除和查询用户信息的方法。
The CustomerService bean is a utility class that implements methods to access the database for adding, updating, removing, and retrieving customer information.
信用级别评定服务，查询用户的信用历史信息。
A credit rating service that queries the user's credit history information.
系统重复相关信息；当用户确认这条信息，或者重复查询时，系统便获得了目标词的一个不同方式的语音表达记录。
The system repeats the information; when the customer confirms it, or repeats the query, the system develops a record of the different ways the target word can be spoken.
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