The pattern of spots in the cosmic microwave background has a suspicious deficiency: there are surprisingly few big spots.

宇宙微波背景中斑点模式有着一个可疑的缺损，这就是几乎没有什么大的斑点。

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Families may also choose a country that offers them the possibility of a child who has a similar ethnic background.

还有一些家庭可能选择让他们领养种族背景与之相似的儿童的国家。

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Here's the background: Once a private company has 500 shareholders, SEC rules require the company to register its private stock and disclose financial results.

背景情况：一旦一家私人公司拥有500名股东，那么根据美国证交会的规定，这家公司必须对它的私募股权进行登记，并且披露其财务业绩。

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So I don't know your mathematical background, but the textbook has an appendix, which is a reasonable measure of how much math you should know.

我不太清楚你们的数学功底,但教材上有附录,它能清楚地告诉你,你应该掌握多少数学

耶鲁公开课 - 基础物理课程节选

The European debt crisis has faded into the background a bit during the home stretch of the U.S. elections, but last week it came back into the headlines.

FORBES: Stocks Stage Veteran's Day Rally

The broadcaster, who has a background in horse racing and sports programmes, broke news of the all-clear to her followers on Twitter - the micro-blogging website.

BBC: presenter Clare Balding gets cancer all-clear

The page uses the words "Augusta National" and even has a background photo of the clubhouse.

WSJ: Augusta: Look but Don't Touch