收集不同环境中发生虐待老人情况的范围和类型的证据（以了解这一问题在全球层面的严重程度和本质）；

building evidence on the scope and types of elder maltreatment in different settings (to understanding the magnitude and nature of the problem at the global level);

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首先介绍了电子证据的收集主体、收集工作应遵循的原则和收集的范围，然后列举并重点分析了收集的措施。

After introducing the subjects of electronic evidence collecting, the principles and scope of collection, this part carries on detailed analysis to collecting manners and methods.

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