该框架响应系统上下文、目标、约束和风险方面的重大更改而重复执行流程。
It repeats the processes in response to major changes in system context, goals, constraints, and risks.
危险品道路运输是一个复杂的系统，风险管理涉及危险品运输规划和事故应急响应。
Hazardous materials (hazmat) transportation by road is a highly heterogeneous and complex system, for which risk management involves hazmat transportation plan and accidents emergency response.
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