由于每次记录与执行中都会新建多种文件，这使得处理多重会话变得十分困难。
Since multiple files are created during each recording and execution, it becomes very difficult to handle multiple dialogs.
车辆调度的预约系统和RDBMS(关系数据库管理系统)必须支持多重、并发的客户会话。
Multiple, simultaneous customer sessions must be supported in the Deals on Wheels reservation system and RDBMS.
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