All above are the background of the subject.

本文就是在此背景下进行研究的。

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The paper introduces the development background of the subject, to complete the development and function of the process.

论文主要介绍了本课题的开发背景，所要完成的功能和开发的过程。

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In the first chapter, the background of the subject and the significance on engineering and academic is introduced in this paper.

首先，论文介绍了本课题的背景以及在工程上和学术上的意义。

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When a moving subject is cut out of a number of images and combined with a different still shot that forms the background, the size of the subject can be changed to suit the background image.

ENGADGET: Casio trots out world's slimmest shock-resistant digicam: EX-G1 (video)

She believes a review is needed of the categories of people who should be subject to routine background checks.

BBC: NEWS | UK | Can background checks ever work?

Previously, the trial bar could use the testimony of people who did not have the background to speak knowledgeably about the subject at hand.

FORBES: Fact and Comment