背景与目标一样是作为检测对象考虑的，而不应作为噪声源考虑。
The background is a detected object as the target, and it can't served as a source of noise.
介绍了教材建设的背景与目标、教材的体系与结构、电子课件的组织形式及教材的使用情况。
This paper describes the background and target of textbook construction, system and structure, organization means and applied state of the textbook.
红外偏振成像技术是一种新的探测技术，其主要利用目标的红外偏振特性背景与目标区分开来。
Infrared polarization imaging technology is a new detection technique, and it can distinguish background and target through the infrared polarization characteristics of target.
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