在美国爱荷华州，靠雨水供养的玉米平均产量为每公顷10吨。
In Iowa in the US, the average rain-fed maize yield is 10 tonnes per hectare.
埃姆斯实验室是属于所有，承包商经营的研究设施的美国能源部说是由美国爱荷华州立大学。
AmesLaboratory is a government-owned, contractor-operated research facilityof the US Department of Energy that is run by Iowa State University.
美国爱荷华州大学Carver医学院研究人员对此进行了在线调查，得出了上述结论并刊登在上个月出版的普通内科医学杂志上。
That, at least, is the conclusion researchers at the University of Iowa Carver College of Medicine came to with a survey published online last month in the Journal of General Internal Medicine.
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