光密介质光密媒质dense: adj. 1.密集的,(物质等)密度大的,(人口等)稠密 ...medium: n. (pl. -dia ) 1.媒介物;传导体;媒质, ...medium, optically denser: 光密介质medium, optically thinner: 光疏介质optically less dense medium: 光疏介质下载手机词典可随时随地查词查翻译