求翻译：重点实施“一区三线”策略，形成以江门主城区为重点，以西部沿海高速公路为主轴的南线、沿银洲湖两岸为中线、沿广湛高速公路为北线的开发格局是什么意思？

Focus on the implementation of "wire" strategy, focusing on formation in Jiangmen city, to the South West Coastal Expressway as the spindle along yinzhouhu line, middle line of the Strait, along the line of wide-Zhan Expressway to the North of development pattern