对于有效期，请确保使用超出应用程序本身和相关应用程序预期生命期的时期。

For the validity period, make sure to use a period that exceeds the expected life of the application and related applications.

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当项目划分为阶段时，同样的过程组一般在项目生命期的每一阶段都重复，并有效地推动项目完成。

When a project is divided into phases, the Process Groups are normally repeated within each phase throughout the project's life to effectively drive the project to completion.

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由于传感器节点的能量主要消耗在传输数据上，所以减少节点数据传输量可以有效延长网络生命期。

As the energy of sensor nodes mainly is consumed in transmitting data, reducing the amount of data transmitted can extend the network lifetime.

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