多巴胺是一种重要的单胺类神经递质，影响人的情绪和行为。

Dopamine is an important ___monoamine neurotransmitter that influences mood and behavior.

这种药物通过调节大脑中的单胺类神经递质发挥作用。

This medication works by regulating ___monoamine neurotransmitters in the brain.