He thinks food is a priceless teaching aid.
他认为食物是无价的教学辅助。
The utility model relates to a teaching aid.
本实用新型涉及一种教具。
The blackboard is a primitive teaching aid used for centuries.
黑板是一种原始的教学辅助工具，已经被使用了数百年了。
The utility model can be produced into a power toy or a teaching aid.
该装置可以制成动力玩具，也可以制成教学用具。
The utility model can be produced into a power toy or a teaching aid.
该装置可以制成动力玩具，也可以制成教学用具。
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