翻译成英文：本论文研究的是生鲜农产品物流配送中的选址-路径问题。随着生鲜农产品市场需求的逐年提升物流配送成为该领域内越来越受关注的话题。通过对生鲜农产品物流配送中的选址-路径问题进行深入分析和探讨本文旨在优化现有的物流配送网络和路径规划提高物流效率和降低成本。具体而言本文采用二阶段式方法即将选址-路径问题拆分为选址定位问题和车辆路径问题两个子问题首先解决上层的生鲜农产品配送选址问题将上层得到的最优

This paper focuses on the site-location and routing problems in logistics and distribution of fresh agricultural products. With the increasing demand for fresh agricultural products, logistics and distribution has become an increasingly important topic in this field. Through in-depth analysis and exploration of the site-location and routing problems in logistics and distribution of fresh agricultural products, this paper aims to optimize the existing logistics and distribution network and route planning, improve logistics efficiency, and reduce costs. Specifically, a two-stage method is adopted, which separates the site-location and routing problems into two sub-problems: site-location and vehicle routing. Firstly, the upper-level problem of site-location for the distribution of fresh agricultural products is solved using an immune algorithm, and the optimal solution obtained is then applied to the lower-level problem of logistics and distribution routing to determine the visiting order of customer points. Genetic algorithm is used for route planning. Secondly, the effectiveness and feasibility of the proposed method are verified through simulation experiments on actual data. Finally, the research results are summarized and future research directions are proposed. Through this study, the logistics and distribution costs of fresh agricultural products can be effectively reduced, and the efficiency of distribution can be improved