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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。
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$firstVoiceSent
- 来自原声例句
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。
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