Overhead transmission lines are the vitals of power system. Its main function is to transmit electricity.

架空输电线路是输电系统的命脉，它的主要作用是传输电能。

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The main advantage of this method is that its overhead is pretty low. Practical results show that this method is very effective.

这种算法最大的优势是开销小，实用性强，对原型系统的测试证明了这种算法的有效性。

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The heat resistant overhead conductors are widely used, as the main renewal conductor type for renovation and capacity expansion of urban networks, in the renovation of regional grids.

耐热架空导线作为城市电网增容改造中的主要换用线种，在各个地区的电网改造中得到了广泛的应用。

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The rain had stopped during the forenoon and three times we had heard planes coming, seen them pass overhead, watched them go far to the left and heard them bombing on the main highroad...."

VOA: special.2011.06.26