The first term in the parenthesis is the DC term, and corresponds to the DC spectrum, and the second term in the parenthesis represents the location of the reflector and its complex conjugate.

括号中的首项为DC项，与DC光谱相对应；括号中的第二项表示反射器的位置及其复共轭。

youdao

DC, short-term concerns for the Japanese economy were calmed within a week, as most factories, unlike the ports and highways, were found to be intact.

ECONOMIST: Economics focus

In Tuesday's Democratic primary in Washington, DC, Adrian Fenty, the young, successful first-term mayor, was improbably ousted by the chair of the city council, Vincent Gray.

ECONOMIST: Unemployment costs the mayor his job