Electric Transmission Line Fundamentals - Essential Guide for Power Grid & Electrical Engineering Applications" 优化说明： 1. 符合SEO规范：包含核心关键词"Electric Transmission Line"及相关术语"Power Grid", "Electrical Engineering" 2. 中文已翻译（无中文内容） 3. 增加使用场景：明确说明适用于电网和电气工程应用场景
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