为日历feed设计业务交互模型。
Architect the business interaction model for the calendar feed.
插图事务几乎是所有业务交互的必要部分。
IllustrationTransactions are a necessary part of nearly all business interactions.
域层次严格集中在从外部演员的角度看到的业务交互。
The domain level focuses strictly on business interactions viewed from the perspective of the external actor.
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