visual aid

(esp pl 尤作复数) picture, film, video, etc used as a teaching aid 直观教具.

virus, visa, viscid, viscosity, viscous, visibility, visible, visibly, vision, visionary, visit, visitation, visited, visiting card (US `calling card), visiting professor, visitor, visitors' book, visor, vista, visual, visual display unit (abbr 缩写 VDU), visualization, visualization, visualisation, visualize, visualize, visualise, visually, vital, vital statistics, vitalism, vitality, vitalize, vitally, vitamin, vitaminize, vitaminise, vitiate, vitiation, viticulture, vitreous, vitrifaction, vitrify,