in DC
指华盛顿特区时，DC 前通常不加 the，也不说 in the DC。
My cousin works for a think tank in DC.
我表兄在华盛顿特区的一家智库工作。
直流电；完全由华盛顿市占据的地区；由乔治·华盛顿选择作为美国首都的地点,由马里兰和弗吉尼亚割让的土地创建；稳定地向一个方向流动的电流
Washington, D.C. (the capital district of the United States)
完全由华盛顿市占据的地区；由乔治·华盛顿选择作为美国首都的地点,由马里兰和弗吉尼亚割让的土地创建
the district occupied entirely by the city of Washington; chosen by George Washington as the site of the capital of the United States and created out of land ceded by Maryland and Virginia
稳定地向一个方向流动的电流
an electric current that flows in one direction steadily
After the meeting, we took a short flight to DC for the conference.
会议结束后，我们乘短途航班前往华盛顿特区参加会议。
用法提示：这里的 DC 是名词，指华盛顿特区（美国首都）。
Many museums in DC are free to the public, so it's a great city for students.
华盛顿特区的许多博物馆对公众免费开放，因此对学生来说是个很棒的城市。
用法提示：DC 在此处作名词，表示华盛顿特区这个城市。
He has lived in DC for over a decade, working in public policy.
他在华盛顿特区住了十多年，从事公共政策工作。
用法提示：句中 DC 为名词，指华盛顿特区。
指华盛顿特区时，DC 前通常不加 the，也不说 in the DC。
My cousin works for a think tank in DC.
我表兄在华盛顿特区的一家智库工作。
DC 常紧跟在 Washington 之后并用逗号隔开，用来区别华盛顿州（Washington State）。
The conference will be held in Washington, DC, next spring.
会议将于明年春天在华盛顿特区举行。
作定语修饰名词，表示“直流的”，与 AC（交流电）相对；一般写大写 DC。
This adapter turns AC power into a DC supply.
这个适配器把交流电转换成直流电源。
grammar · medium
易错句子She moved to the DC last year.
正确表达She moved to DC last year.
DC 指华盛顿特区这一城市或地区时是专有名词，前面不加定冠词 the。汉语名词没有冠词，学习者容易多写 the。
grammar · medium
易错句子We arrived at DC at noon.
正确表达We arrived in DC at noon.
arrive 后接城市、国家等较大地点时用 in，at 只用于车站、路口等小地点。DC 是城市，所以要用 in。
grammar · medium
易错句子DC is capital of the United States.
正确表达DC is the capital of the United States.
capital 在这里是可数名词单数，且特指美国首都，必须加定冠词 the。汉语没有冠词，学习者容易漏掉 the。
华盛顿特区（美国首都）
She moved to Washington, DC last year to work for a nonprofit.
她去年搬到华盛顿特区，在一家非营利组织工作。
华盛顿特区一带
Housing is expensive in the DC area.
华盛顿特区一带的房价很贵。
华盛顿特区市中心
We spent the afternoon walking around downtown DC.
我们下午在华盛顿特区市中心逛了逛。
直流电；直流电力
This device runs on DC power from a battery.
这个设备靠电池提供的直流电运行。
直流电动机
The toy car uses a small DC motor.
这辆玩具车用的是一个小型直流电动机。
直流电压
Measure the DC voltage across the terminals.
测量端子两端的直流电压。
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