Choosing the subject is base on this background.

本文的选题正是基于这样一个大背景。

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So aviation bus test system is generated based on this background.

航空总线测试系统正是在这种背景下产生的。

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Based on this background, this thesis proposes a location scheme based on special SMS.

在这种背景下，本文提出了基于特殊短信的场强定位方法。

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Let me give a little bit background on positive psychology: how we came about and how this class came about.

下面介绍一下积极心理学的背景：,它是如何诞生的，这门课是如何诞生的。

哈佛公开课 - 幸福课课程节选

Dahlia you live in Virginia, give us some background on this man - would you please?

NPR: Sex Offender Loses Bid to Stay Off Web ID List

The arrival of the bipartisan deal on expanding background checks this week appeared to revive fading support for the concept.

WSJ: Gun Measure Clears Senate Hurdle

This is on background -- senior administration officials.

WHITEHOUSE: Via Conference Call