• You can train it to flap its wings to escape a situation but it's very difficult to get it to flap its wings for food.

    你可以训练鸽子,通过扇动翅膀来脱离某个情境,但却很难通过训练鸽子扇动翅膀来进食。

    耶鲁公开课 - 心理学导论课程节选

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