Douglas Gentile, a child psychologist and associate professor at Iowa State University in Ames, Iowa, who studies the effects of media on children, says texting, Facebook and video games are not inherently bad.
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But he says testing the sail in space will be critical.
但他表示,在太空中测试这种帆将是至关重要的。
The agency says testing programs and health worker skills have improved.
该机构说,检测程序和健康工作人员技能也得到了提高。
A lack of field testing, he says, meant a lot of stoves were simply unsuited to users' needs.
他说,缺少野外测试意味着许多炉具简直不符合用户要求。
He says the testing campaign may put additional stress on the health system, but that will show where the weaknesses are.
VOA: special.2010.04.28
And that,he says, could require at least three more years of research to reach the point of testing in people.
VOA: special.2009.03.04
Now,Paul Wyatt says a drug based on the research could be ready for testing in humans within eighteen months.
VOA: special.2010.04.07
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