描述—开始状态、结束状态主流程描述和变更。
Description — start state, end state, description of main flow, and variations.
User2将会对模型做一些更改，并将这些更改交付给主流程。
User2 will make some changes to the models and deliver them to the main stream.
User2将会对模型做一些更改，并将这些更改交付给主流程。
User2 will make some changes to the models and deliver them to the main stream.
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