Diodes are electronic devices which rectify alternatingcurrent to direct current.
二极管是将交流电整流成直流电的电子装置。
2
The disadvantage is that reverse electrodialysis produces direct current, whereas the world runs mostly on alternatingcurrent.
不足处是反向电渗析产生的是直流电，而世界上主要使用交流电。
3
The system generates a direct current, so using it to power DC devices locally is more efficient than switching to the alternatingcurrent needed to feed it back to the grid.