The system generates a direct current, so using it to power DC devices locally is more efficient than switching to the alternating current needed to feed it back to the grid.

该系统产生的电流为直流电，所以用来驱动本地的直流点装置比将其转化为交流电输入电网来的更有效率。

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This system supplies water to boilers by alternating header pipes.

本系统采用切换母管制向锅炉供水。

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By this method, we can design a data acquisition system in which an alternating pulse serves as the input signal with a microcomputer.

采用这一新的方法，可用计算机设计输入信号为交替脉冲的这一类数据采集系统。

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And there is indeed a sense of movement towards bipolar politics and a system of alternating governments.

ECONOMIST: Romano Prodi, Italy��s would-be record-breaker

For the 12, 000-seat basketball arena, architects at Wilkinson Eyre devised a rapidly erected steel-frame system shrink-wrapped with a white PVC skin, the curved steel stretchers forming a pattern of alternating diagonal projections on the outside.

WSJ: London Olympics 2012 | These Knock-Down, Shrinkable Games | By Hugh Pearman