darkness resulting from the extinction of lights (as in a city invisible to enemy aircraft)
同义词:blackout, dimout
brownout详细解释
brown.out n.(名词)A reduction or cutback in electric power, especially as a result of a shortage, a mechanical failure, or overuse by consumers.部分灯火管制:由于电力不足、发电机出故障或用户用电过度而减少电力供应或停止供电 来源:brownbrown(black)out(black)out