Primary research flushes out information obtained from secondary research regarding attitudes, opinions, and beliefs.

一手情报能够排除从二手情报获得信息的态度、观点和信念。

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One of those opinions confirms the conventional wisdom that U.S. higher education, especially at our elite research universities, is world class while primary and secondary education, especially in our big city school systems, are lagging badly.

FORBES: Why Fixing America's Schools Means Increasing Teacher Productivity

According to ACNielsen International Research, more than 724, 000 Americans say eBay is their primary or secondary source of income.

FORBES: Gaming EBay

He quoted research by the gay rights organisation Stonewall which suggested that 90% of secondary teachers and 40%of primary teachers had regularly witnessed homophobic bullying.

BBC: MP Iain Stewart on how he was bullied for being gay