Infrared image has the features of high background, low contrast and low SNR.

红外图像具有高背景，低反差，低信噪比等特点。

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However, for a limited number of people living in known high background radiation areas of the world, doses can exceed 20 mSv per year.

然而对于数量不多的生活在全球已知高辐射环境地区的人们来说，每年的剂量可超过20 mSv。

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This paper reports a differential magnetic localization algorithm in high background magnetic field that interferes localization of permanent magnet.

为了有效去除高背景磁场对永磁体定位的磁干扰，本文提出了一种高背景磁场下的差分磁定位算法。

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So generally and those of you coming from high school computer science background probably used An Integrated Development Environment which actually is a gooey with menus and icons and such.

对于你们这些,有着高中电脑知识背景的同学可能一般用,即“集成开发环境“,它有一些菜单，图标等等。

哈佛公开课 - 计算机科学课程节选

And I have actually seen evidence over the years, mercifully, just a small amount of evidence, but there are, in a group like this, always a few students who come in with a really strong background in high school.

这几年我已经见到了实例，令人感激的是，只有小部分人，但在这，像这样的一个小组，总有一些来到我们这的学生,在高中打下了良好的基础。

麻省理工公开课 - 固态化学导论课程节选

Let's go back to high school for a moment, just by way of background.

让我们回到高中，去寻找一些相关背景。

麻省理工公开课 - 固态化学导论课程节选

High numbers of background checks are usually seen during the holiday shopping months of November and December.

CNN: Gun checks top two million for fourth-straight month

In fact, Mr. Gurenlain has a high school wrestling background.

WSJ: Urban Gardner: Lacrosse, the Sport of Scholarships

Margolis is using his high-tech background, his communications and sales skills, his understanding of the passionate watch customer, and his newly acquired Swiss watch industry experience, to create ways to appeal to watch lovers in the modern world.

FORBES: Michael Margolis: From Watch Lover to Brand Leader at Girard-Perregaux