polygonal overhead contact system中文什么意思

• 边形架空接触网

• overhead-contact system:    加空接触网系统
• vertical overhead contact system:    多边形架空接触网
• catenary overhead contact line:    链线架空接触线
• inclined overhead contact line:    斜链形悬挂的架空接触线
• overhead contact line:    架空接触线