When the free electrons in a conductor move in one direction only. The current thus established is called a direct current, which is often abbreviated to DC.

当导体的自由电子只以一个方向运动时，这样产生的电流叫做直流电，常缩写为。

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DC has many wonderful, free museums and beautiful monuments to remind us of history.

华盛顿有令人惊叹的、免费的博物馆和能让我们回忆起历史的很漂亮的纪念碑。

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Their electronically commutated brushless DC motor provides virtually maintenance-free operation over time by eliminating brush maintenance and associated brush motor failure.

其电子换向直流无刷电机通过排除刷子维护和关联电机的出错，在操作过程中提供免维护操作。

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On June 21st his bank became a plaintiff in a legal challenge brought with two free-market entities in Washington, DC, the Competitive Enterprise Institute and the 60 Plus Association, arguing that Dodd-Frank is unconstitutional.

ECONOMIST: A tiny Texas bank challenges Dodd-Frank

DC, to discuss the future of the North American Free-Trade Agreement.

ECONOMIST: A worldly spin from George Bush