Graphics are used in textbooks as part of the language of the discipline, as in math or economics, or as study aids.

在教科书中，图形作为学科语言的一部分使用，如数学或经济学中，或作为学习辅助工具使用。

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This paper includes five part. The first part investigates the origins of study aids.

论文主要分为五部分：第一节谈考试参考书的起源；

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To follow up on the many study aids recommended in this article, see the Resources section.

如果您想使用本文中推荐的许多学习辅导，请参阅 参考资料部分。

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More detailed results of the study are expected to be presented at an AIDS vaccine conference in Paris next month.

VOA: special.2009.09.30

The study was done by South African scientists with the Center for the AIDS Program of Research in South Africa.

VOA: special.2010.07.21

The study linked almost one in every five such deaths in two thousand eight to the virus that causes AIDS.

VOA: special.2010.04.14

Examinations regulators, Ofqual, are planning to investigate potential conflicts of interest in the sector, particularly in relation to study aids such as text books and training services.

BBC: 'They told us how to pass the exam'

Hilary said when she read about the NIH AIDS study in 2006, she was delighted to learn there could be additional public health benefits to circumcision.

CNN: Circumcising our son -- How do we decide?

Researchers are aware that a similar four-year study led by the United Nations Aids group on another gel, was unsuccessful.

BBC: Seaweed gel could protect against HIV