Initially, Ricardo Ramos thought it was a drill when the ground began to shake on Tuesday. This was the day for it, after all.
원문출처 : http://www.cnn.com/2017/09/19/americas/mexico-city-earthquake-drill/index.html
원문출처 : http://www.cnn.com/2017/09/19/americas/mexico-city-earthquake-drill/index.html