以下为句子列表：
英文: Based on the propagation law of partially coherent light, spectral changes of a polychromatic Gaussian-Schell model beam propagating in free space is studied.
中文: 摘要基于部分相干光的传输定律，研究了多色高斯－谢尔模型光束在自由空间中传输的光谱变化。
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英文: By describing the in-out quantities and connecting character of the workflow's basic nodes, the nodes are presented by the polychromatic sets according to these characters.
中文: 摘要描述了工作流基本节点的出入度及连通性质，并根据这些性质提出了工作流基本节点的多色集合表示方法。
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英文: Compared with the conventional methods, assembly planning sequence based on polychromatic sets excludes the unreasonable assembly sequences in advance to avoid the exponential explosion due to the expansion of constrain relation.
中文: 与传统的装配序列规划方法相比，基于多色集合理论的装配序列规划方法通过装配约束关系方程，提前排除了不合理的装配序列，因此避免了由约束信息膨胀产生的组合爆炸。
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英文: On the basis of this description method, modeling steps of the workflow using polychromatic sets are proposed and the corresponding acquiring algorithm of the workflow's routes is achieved.
中文: 在这种表示方法的基础上提出了基于多色集合理论的工作流建模步骤，并给出了工作流路径求取算法。
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英文: Taking mold manufacturing workflow as an example, polychromatic sets function character matrix of the molds manufacturing workflow is established, Boolean matrix of the nodes is presented and flow routes for expressing all possible functions of the molds
中文: 最后，以模具制造工作流过程为例，根据基于多色集合理论的工作流建模理论提出的步骤和算法，建立了模具制造流程的多色集合功能围道矩阵，给出了节点的布尔矩阵，并得出了表示模具制造过程中所有可能的流程路径。
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