visual aid
noun [ C ] uk/ˌvɪʒ.u.əl ˈeɪd/ us/ˌvɪʒ.u.əl ˈeɪd/
直观教具
something that you are shown, such as a picture, film, or map, in order to help you understand or remember information
英汉双解词典收录81607条英汉双解翻译词条，基本涵盖了全部常用单词的读音、翻译及用法，是英语学习的有利工具。