Serotonin is a neurotransmitter that has the effect of reducing pain, decreasing appetite, and producing a sense of calm, and in too large a quantity, inducing sleep.

• 这种血清素是一种神经递质，它有减轻疼痛，降低食欲，镇静的作用，一旦作用剂量较大时，它能促进睡眠。