teaching aid

基本解释

The idea to design a math teaching aid came about while Emily was teaching math classes to the students.
当艾米丽给孩子们上数学课时，她突发奇想，设计一套数学教具的想法在她的脑子里应运而生。
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Again it should be noted that this algorithm was designed as a teaching aid and further refinement is needed it can be used in a production setting.
再次强调这个算法是为了教学目的而设计的，如果要将其运用于产品的构建上那么它还需要进行更多的改进。
I undertook to show this was true in an extreme case, merely because it would serve as a good teaching aid to those whose temptation to give in to anger and assault would not be so extreme.
我以一个极端的例子向你证明此言不虚，有鉴于不少人受到的诱惑还没那么严重，就禁不住发怒与攻击，我的前例对他们会是一个很好的教学工具。
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There were charts, pictures, and any other teaching aid he thought would help me understand what he was teaching.
FORBES: Growing Up And Liking It
Admittedly, this is a sensitive topic for most people, so I have turned to an unlikely resource — namely, comic books — to aid in teaching about complex and evolving gender issues.
FORBES: What Do Comic Books Teach Us About Gender Attitudes?

any device, object, or machine used by a teacher to clarify or enliven a subject