an ear of corn, 一穗玉米/ 一根玉米

President Obama visits Ethiopia
U.S. President Barack Obama holds up an ear of corn during a tour of Faffa Food, July 28, 2015, in Addis Ababa, Ethiopia. (Photo: Evan Vucci/AP)
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President Obama visits Ethiopia
https://www.yahoo.com/politics/president-obama-visits-ethiopia-c1437999731858.html

Barack Obama: Le showman en Afrique - Image 15 sur 17 - 20minutes.fr
http://www.20minutes.fr/monde/diaporama-9102-photo-914694-barack-obama-showman-afrique