进程的一个单独执行单位，线程可并发运行。
A single unit of execution within a process; threads run concurrently.
较多的存储单位可以保证执行单位充分工作。
Memory units should always more than performance units, so it can working efficiently.
在此过程中风险管理执行单位扮演重要的评估角色。
During this process, the RMIU shall play an important evaluation role.
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