Later, in a letter to Skinner, Pressey would concede there was a massive pedagogical limitation to the device: Students learned how to master the machine, but not the subject matter.
南方人物周刊：我明白了，我的问法不对，“小人物”这个提法，庸俗了。
，详情可参考哔哩哔哩
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Why vulnerable Gulf energy assets are rattling the world
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