The paper considers traffic stream theory as directive thinking and designs network road traffic stream simulating platform using OPNET network simulating software.

以交通流理论为指导思想，提出采用OPNET 网络仿真软件设计网络道路交通流仿真平台。

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But if a patient executes an advance directive, after thinking it through, they are not only doing the right thing for themselves and their families, they are doing what is best for society by not using up resources they do not wish to use.

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