Definition: a piece of equipment that helps you to do something Level: C1
计算器是解决数学问题的方便辅助工具。
A calculator is a handy ___aid for solving math problems.
一本好字典可以是学习新语言的有用辅助工具。
A good dictionary can be a useful ___aid in learning a new language.
互动软件是一种有效的教学辅助工具。
Interactive software is an effective teaching ___aid.
