After the localization of the region of the road, we need to update the background because of the transformations of background caused by the changes of environment such as light.

在完成了路面区域的定位后，因为光线等环境变化引起的背景变化会影响运动检测的结果，所以需要对背景进行更新。

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He will discuss broadly the American role in the transformations taking place in the region.

WHITEHOUSE: Press Briefing