The description of the process model consists of the concurrent and dependent relationships of activities, activity firing conditions, event sequences and document management.

该模型描述了活动的并发执行和依赖关系、活动激发的条件、事件顺序及文档管理等信息。

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Downregulation of these pathways in normal organs can lead to vascular disturbances and even regression of blood vessels, which could be intensified by concurrent pathological conditions.

在正常器官中，这些信号途径下调能导致血管紊乱，甚至血管衰退，而且这些都可能由于同时发生的病理状态而加重。

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The practical conditions of executing concurrent engineering are analyzed.

在此基础上分析了在实际中实施并行工程的条件。

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