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矢量散度、旋度特征和锋生锋消现象的联系，并和与此台风前期路径及强度相似、但进入西风带后很快消失了的8406号台风的诊断结果进行了对比。
The result was compared with another typhoon (8406) whose early path and intensity were similar to 8509 but not developed when it entered the westerly belt.
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