In the widely used traditional DAO/Repository pattern, DAOs have the responsibility to perform persistence operations, which are purely behavioral, and entities are supposed to hold state.
从广泛使用的DAO/Repository模式的角度来说，DAO只负责执行持久化操作，而实体则只维护其状态。
Conversations: a conversation is a special form of interaction pattern where the parties involved have awareness of previously exchanged messages (that is, the parties hold state information).
对话：对话是一种特殊的交互模式形式，其中涉及的各方都知道之前交换的消息(即各方均保留状态信息)。
Conversations: a conversation is a special form of interaction pattern where the parties involved have awareness of previously exchanged messages (that is, the parties hold state information).
对话：对话是一种特殊的交互模式形式，其中涉及的各方都知道之前交换的消息(即各方均保留状态信息)。
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