视图系统,包括对局部视图和集合视图的支持。
用于更改或更新视图的系统事件几乎总是(为什么我敢说总是呢?)用户请求。
The system event for changing or updating a view is almost always (dare I say always?) a request from the user.
可用性视图考虑系统及其环境的可用性。
The usability view considers the usability aspects of the system and its environment.
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