时间轴是单词和日期的有序组，显示事件发生的时间。

A timeline is an ordered group of words and dates that shows when events happened.

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捕获时间轴的结构(模型)及其里程碑、事件和通知。

Capture the structure (model) of the timeline and its corresponding milestones, events, and notifications.

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业务用户定制时间轴/里程碑模型以创建一个特定于用户的模型，并定义该模型需要的业务事件。

The business user customizes the timeline/milestone model to create a user-specific model, and defines business events required by the model.

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