a mobile device used while watching television, especially to access additional content or apps The app allows users to use their device as a second screen, offering additional information about the film they're watching on TV. 该应用程序允许用户将其设备用作第二屏幕，提供有关他们在电视上观看的电影的其他信息。 a second-screen app 第二屏应用 a second-screen experience 第二屏体验