这种成分被用来平衡产品中的酸碱值，能够引起过敏反应，并刺激你的眼睛、鼻子和皮肤。

This ingredient is used to balance the PH in products, and can cause allergic reactions, and irritate your eyes, nose and skin.

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这两种测量方法的差别为研究者提供了对于刺激反应的水平和持续时间的指示。

The difference between the two measures provides the researcher with an indication of the level and duration of the response to the stimulus.

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然而，长时间的气味刺激可以产生更持久的反应减少，可能涉及中枢神经系统通路的高层结构。

Prolonged odor stimulation, however, could produce more long-lasting reductions in response, possibly involving structures higher in the central nervous system pathway.

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So, the idea here is, repeated pairings of the unconditioned stimulus and the conditioned stimulus will give rise to the response.

这里的意思是说，无条件刺激与条件刺激的反复匹配,会引起条件反应。

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But what happens through learning is that another association develops that between the conditioned stimulus and the conditioned response.

但学习会在条件刺激与条件反应之间,建立起另一种联结。

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He developed the theory of classical conditioning by making a distinction between two sorts of conditioning, two sorts of stimulus response relationships.

他通过区分两种条件作用,两种刺激反应关系，提出了经典条件作用理论。

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