1. A material used for insulation; an insulator. 
   绝缘材料用于绝缘的材料；绝缘体
2. a light fibrous material used as an insulator. 
   轻的纤维性材料，用作绝缘体。
3. Usually a high voltage is carried by the overhead-wire system, and the third rail has current at a much lower voltage. This is because of the danger that a man on the line might touch the electric rail, but he can not touch an overhead wire. 
   通常高压电被高架线系统输送，第三根铁轨里的电压则是很低的，这是因为如果一个站在线路上的人就可能碰到电轨，那是很危险的，但是他不可能碰到高架线。
4. An aircraft droned overhead. 
   飞机在上空发出嗡嗡声.
5. On the overhead rack. 
   放到行李架上。

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• 1. 悬式线路绝缘子
  overhead line 架空管道; 架空线...overhead line insulator 悬式线路绝缘子...overhead loader 高架装载机
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