• The communist North called off reunions in response to what it considers South Korean President Lee Myung Bak's hard-line policy.

    VOA: standard.2009.08.26

  • And now the bell--When--You start off with the unconditioned stimulus, unconditioned response.

    开始时呈现无条件刺激,会出现无条件反应。

    耶鲁公开课 - 心理学导论课程节选

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