The lever gets them out of the box, but after more and more trials they stopped scratching at the bars, pushing at the ceiling and so on.
杠杆让它们逃出迷笼,但在经历多次尝试之后,它们不再抓栏杆,不再推顶棚。
耶鲁公开课 - 心理学导论课程节选
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