They are traditionally lightweight and used for executing tasks such as cache cleanup and object cleanup.

这些线程通常都是轻量级的，用于执行缓存清理和对象清理之类的事务。

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Cleanup takes the claim token in the data object of type TicketEnvelope to locate and remove the attachment content from storage.

清除操作接受ticketenvelope类型的数据对象中的索取令牌来定位并从存储中删除附件内容。

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The constructor and destructor methods of this object do the necessary setup and cleanup.

这个对象的constructor和destructor方法执行必需的设置和清除工作。

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