来自《耶鲁大学开放课程：心理学导论 第2集 第2集》

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  and correspondingly two sorts of drugs.
  相应地 也就有两种对应的药物
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  There are agonists.
  一种是兴奋剂
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  And what an agonist does is increases the effect of neurotransmitters,
  兴奋剂会增加神经递质的作用效果
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  either by making more neurotransmitters
  有可能是通过释放更多的神经递质而实现
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  or stopping the cleanup of neurotransmitters,
  也可能是通过阻止神经递质的排出而实现
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  or in some cases by faking a neurotransmitter,
  也有时候是通过伪造神经递质
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  by mimicking its effects.
  通过模仿神经递质的效果来实现的
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  Then, there are antagonists
  另一种是抑制剂
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  that slow down the amount of neurotransmitters,
  抑制剂会抑制神经递质的释放量
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  either because they destroy neurotransmitters
  有可能是通过破坏神经递质而实现
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  or they make it hard to create more.
  也可能是通过抑制神经递质的生成而实现
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  Or in some cases they go to the dendrite of the neuron
  有时这些药物会渗透到神经元的树突