One of the NEJM studies also showed that many older Americans as well as recipients of the 1976 swine flu vaccine may already be protected against the new virus.

NEJM的一项研究还显示，许多美国老年人和1976年猪流感疫苗的接种者可能都已经对这种新病毒有了免疫力。

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Some genetic and time-dating studies point to the possibility that ancient Americans came from other places and arrived earlier than Clovis sites in North America.

一些基因和年代测定的研究指出远古美国人可能来自其他地方，而且比北美洲的克伦维斯人来的早。

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Another change is that poor Americans have been displaced by poor immigrants-who, as studies have repeatedly shown, are much better behaved than natives of similar means.

另一个变化是贫穷的美国人已经被贫穷的移民代替——而这些移民，有研究不断证明，比处于同一阶层的亲戚要更守法。

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In recent years, public opinion studies show more than half of Americans approve of nuclear energy with greater support among men than women.

VOA: special.2010.02.19

Public opinion studies show that the war has grown increasingly unpopular with Americans.

VOA: special.2010.01.02

Numerous studies indicate African-Americans and Hispanics receive a poorer quality of health care than non-Hispanic whites, even when they have the same levels of income and health insurance coverage.

VOA: standard.2010.03.05

That mistrust has also resulted, Clinton said, into too little participation by African Americans in modern medical studies.

CNN: Clinton Apologizes To Tuskegee Experiment Victims

On the one hand, studies show that Americans are wary of companies having access to their personal information.

FORBES: Why We Blab Our Intimate Secrets on Facebook

Studies show most Americans think their advisor acts solely in their interest.

FORBES: Is Your Financial Advisor A Wolf In Sheep's Clothing?