Please show me the free background of the picture, the AD now we make is not shown clearly.

请提供空白的图片背景，现在这个广告做出来是不清楚的。

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Free technical support is often available in the form of mailing list or newsgroup discussions; nevertheless some background research, knowledge or experience is often required.

免费的技术支持也可以以邮件列表或新闻讨论组的形式得到。然而，某种形式的背景研究、知识或经验常常是需要的。

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The free copy of a book can be custom edited by the publishers to reflect your own previous reading background.

一本书的免费拷贝可以被出版商定制以反映你过往的阅读背景。

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In the case of the NRA, this is reflected in its reversal on policies it supported in the past, such as gun-free school zones and universal background checks.

CNN: NRA's enemies list: Most of America

These include the proportion of children under five on free school meals achieving a "good level of development" compared with other children, attainment at age 16 of those eligible for free school meals and higher education enrolment by social background.

BBC: Birth weight among social mobility checks - Nick Clegg

"It will be a police service which everybody, whatever their background, whatever their identity, will feel free to join, " he said.

BBC: Mandelson warns against RUC 'hype'