生命周期项目均具有明确的开始时间和结束时间。

The life cycle of projects have specific start and end times.

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项目生命周期定义了项目的开始和结束。

Project Life Cycle serves to define the beginning and the end of a project.

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项目生命周期定义了项目的开始和结束。

Project Life Cycle serves to define the beginning and the end of a project.

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