求翻译：影响过程执行时间的因素很多，与执行过程的外部环境、执行过程需要的资源、执行人的能力等息息相关。因此，过程执行的时间是不确定的，但可以根据过去执行的经验，估算一个过程执行的正常时间、最长时间及最短时间，可以建立过程 的执行时间离散概率模型，描述如下：是什么意思？

Execution time factors affect the process and the implementation process of the external environment, the implementation process requires resources, closely related to the capacity of executor. Therefore, the process execution time is uncertain, but based on past implementation experience to estimat

During the impact the time there are many factors and the implementation process, the external environment, the need to process the resource, such as the ability of the people who are closely related. Therefore, the process of implementation time is not determined, but can be carried out in the past

The influence process execution time factor are very many, with the implementation external environment, the implementation needs the resources, carries out human's ability and so on to be closely linked.Therefore, the process execution time is indefinite, but may the experience which carried out ac

Many factors affect the procedure execution time, and during the execution of the external environment, the process of implementation requires resources, implementation of human capacities are closely related. Therefore, procedure execution time is uncertain, but can be performed based on past exper

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