TransactionService：在服务中定义事务上下文，允许在同时操作多项任务时清除数据操作。
TransactionService: Defines transaction context within services, allowing for clean data operations when multiple tasks are operating at the same time.
TransactionService：在服务中定义事务上下文，允许在同时操作多项任务时清除数据操作。
TransactionService: Defines transaction context within services, allowing for clean data operations when multiple tasks are operating at the same time.
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