There are mainly two structures of CNC'S RTOS. They are foreground-background type and interrupt type.

计算机数控的操作系统目前主要有前后台型及中断型二种结构。

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For example, a film-maker might opt to include the background sound of an ambulance's siren while the foreground sound and image portrays an arguing couple.

例如，电影制作人可能会选择在背景中加入救护车的警笛声，而在前景的声音和图像中表现一对争吵的夫妇。

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By blurring objects in the foreground, background or by blurring the entire design, you can dramatically increase the impact of your project.

通过模糊前景、模糊背景，甚至整个设计，你可以动态地增加你的项目的冲击力。

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As with its little brother, though, the flash was borderline useless -- washing out anything in the foreground and casting the background into almost complete darkness.

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Web Workers, for instance, is an emerging system for isolating a browser's individual tasks into separate "threads, " making it easier for a browser-based program to perform a computationally intensive task such as photo-editing in a background tab while the user is attending to something else, like e-mail, in the foreground.

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