Direct electrical current.

直流电流。

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Battery CHARGER, an electrical device supplied with alternating current, which produces a direct current output for charging the battery on the airplane.

电瓶充电器，用交流电向飞机内电瓶充电的电气装置。带有交流电的电气装置，该装置产生直流电向飞机上的电瓶充电。

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Electrical couplings promote the passage of certain signals but prevent the passage of others, such as an alternating current coupling that excludes direct current.

电子耦合器(联接器)能够使某些信号通过而阻止另一些信号通过，如阻止直流电流通过的交流耦合器。

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They used a technique called transcranial direct current stimulation, or tDCS. If you pass a weak electrical current through part of the brain, it temporarily and safely disrupts neural activity.

WSJ: Mind & Matter: Alison Gopnik on Beating the Brain's Curbs on Innovation