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.

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