视觉暂留视觉暂留(英文:Persistence of vision)也称为正片后像,是光对视网膜所产生的视觉,在光停止作用后,仍然保留一段时间的现象,其具体应用是电影的拍摄和放映。原因是由视神经的反应速
罗伯特·威尔基Robert Leon Wilkie Jr. (born August 2, 1962) is an American lawyer and government official serving as the United States Secretary of Veterans Affairs. He was co