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In the 1950s, legendary behaviorist B.F. Skinner debuted his version of a “teaching machine,” based on the 1924 invention of Ohio State University psychology professor Sidney Pressey. The contraption was loaded with a piece of paper with questions, and students pressed keys indicating the correct answer, at which point another question would appear. Both Pressey and Skinner ran into similar problems, though, failing to implement the technology in schools. Educators weren’t convinced of the machine’s benefit, which prioritized individually paced learning not conducive to students of the same age moving through a grade level at the same time.
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王小虎：政权更迭的成本极高，只有伊朗内部出现根本性的动荡与分裂，才有可能实现。尽管伊朗国内经济状况不佳，但远没有到达政权崩溃的临界点，其伊斯兰革命卫队依然拥有极强的实力与控制力。