通常是由于持久化框架在编译期或者运行期修改类的定义，添加某些所需信息以减少持久化实体时的麻烦。

Usually the problem occurs because the persistence frameworks will alter classes during compilation or runtime, to include information they require, to ease the pain related to persisting entities.

youdao

通常是由于持久化框架在编译期或者运行期修改类的定义，添加某些所需信息以减少持久化实体时的麻烦。

Usually the problem occurs because the persistence frameworks will alter classes during compilation or runtime, to include information they require, to ease the pain related to persisting entities.

youdao