It wasn't the screech of cannonballs, the thud of grappling hooks or the crack of muskets that most terrified that sailors of the Spanish Armada in the 16th century, but fire.
원문출처 : http://edition.cnn.com/2015/02/12/tech/mci-saffir-robot/index.html?eref=edition
원문출처 : http://edition.cnn.com/2015/02/12/tech/mci-saffir-robot/index.html?eref=edition