劍橋詞典 DC noun [U] (ELECTRICITY) abbreviation for direct current : electrical current that always flows in one direction 直流電（direct current的縮寫(xiě)） 比較AC (ELECTRICITY) DC noun [U] (ADDRESS) abbreviation for the District of Columbia: an area of the eastern US that has the same borders as the US capital , Washington, and is not part of a US state 哥倫比亞特區(qū)（the District of Columbia的縮寫(xiě)） 返回 DC