visual training aids视力训练辅助器材
visual l aids视觉辅助教具
visual navigation aids目视航标
visual ground aids目视地面助航设备
Visual teaching aids直观教具教学法
visual navigational aids视觉航标
audio-visual sales aids视听广告设备
Using Visual Aids使用视听器材
Use Appropriate Visual Aids用合适实物
presentation with visual aids带有视觉辅助的讲座
N-COUNT（可数名词） Visual aids are things that you can look at, such as a film, model, map, or slides, to help you understand something or to remember information. 直观教具