可卡因并不是随便的比喻，爬行类的大脑，神经系统最原始的部分之一，在人类熟睡后生产大量的多巴胺。
And cocaine is more than an idle metaphor. The reptilian brain — one of the nervous system's most ancient parts — floods you with dopamine, just as it does after you snort a line of blow.
在一个月后，这些大鼠的脑部结构适应了增加的多巴胺浓度，某些类型的多巴胺受体数量较以往更少，而类鸦片受体(opioid receptors)则变多。
After a month, the structure of the brains of these rats ADAPTS to increased dopamine levels, showing fewer of a certain type of dopamine receptor than they used to have and more opioid receptors.
撤药反应的出现可能与药物对中枢神经系统中血清素、多巴胺、去甲肾上腺素、GABA、胆碱能类递质系统的影响有关。
Appearance of withdrawal reactions may associated with pharmacological effects on serotonin, dopamine, norepinephrine, GABA and cholinergic transmitter in central nervous system.
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