However, it may be necessary at times to have further control of transactions.
然而，有时对事务进行进一步的控制也是很必要的。
Provide a mechanism to control transactions on a task-by-task basis for each activity.
提供一种机制以逐个任务为基础控制每个活动的事务。
They propagate transactions and control the quality and timing of message delivery.
它们传播事务、管理质量和消息传递定时。
Foreign exchange transactions. Regulations on foreign exchange control.
外汇帐户，外汇管理条例。
Concurrency control of transactions is the emphasis of such study.
而事务的并发控制，则是研究的重点。
Concurrency control of transactions is the emphasis of such study.
而事务的并发控制，则是研究的重点。
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