1. Overhead stretch high-tension lines, 1000 kilometres in all. 
   上方有总长1000公里的高压线。
2. Keep away from the high-tension power line. 
   勿靠近高压电线。
3. A steel tower supporting high-tension wires. 
   架高压电缆的铁塔用来支撑高压电线的铁塔
4. 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。
5. It came in so high that I had to smash it with an overhead return. 
   那球实在太高了，我必须把球拍高举过头反击回去。

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• 1. 高压架空线路
  general purpose lines of overhead 一般用途信用限额...high-tension overhead line 高压架空线路...inclined overhead contact line 斜链形悬挂的架空接触线
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