A sign depicting an airplane Swedish Road Signs Collection on Wikicommons - URL http://commons.wikimedia.org/wiki/Category:Road_signs_of_Sweden information about why this image is in the public domain can be found there 飞机 机场 平面 飞机道路标志牌上写
sign airplane transportation road roadsigns roadsign Airplane Roadsign clip art vector graphic can be downloaded for free 飞机 道路标志牌上写 剪辑 飞机道路标志牌上写