1. I'll contact the driver by radio. Please hold the line a moment. 
   我用无线电联络司机，请稍等一下。
2. 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。
3. An aircraft droned overhead. 
   飞机在上空发出嗡嗡声.
4. On the overhead rack. 
   放到行李架上。
5. The sky arches overhead. 
   天空在上边成拱形。

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• 1. 斜链形悬挂的架空接触线
  [地质]倾斜接触 inclined overhead contact line...斜链形悬挂的架空接触线 increased contact pressure...{n.}增加的接触压力 independent contact
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