1. poles and towers of transmission line 
   线路杆塔
2. a line of latitude at the north or south poles. 
   围绕北极或南极的纬线。
3. an imaginary line passing through both magnetic poles of the Earth. 
   通过地球两个磁极的假想线。
4. The earth's axis is the line between the North and South Poles. 
   地轴是南北极之间的线.
5. an imaginary line around the Earth forming the great circle that is equidistant from the north and south poles. 
   想象中环绕地球表面距南北两极距离相等的大圆。

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  首页 > 学术期刊 > 湖南电力 > 2008年6期 > 架空输电线路杆塔接地装置...架空输电线路杆塔接地装置discussion on grounding device for poles and towers of overhead transmission line
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