NASA has successfully tested a new shape memory alloy that allows the outer portion of aircraft wings to fold in midair.
원문출처 : http://www.cnn.com/videos/cnnmoney/2018/01/24/nasa-alloy-fold-wings-abc-orig-vstan.cnn
원문출처 : http://www.cnn.com/videos/cnnmoney/2018/01/24/nasa-alloy-fold-wings-abc-orig-vstan.cnn