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1.The serotonin levels in the brain were measured to determine if it was a good idea for him to take the medication.
测量大脑中的血清素水平以确定他服用该药物是否是个好主意。
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2.The study found that the use of this drug could potentially increase the risk of developing an allergic reaction.
研究发现，这种药物的使用可能会增加患上过敏反应的风险。
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3.The researchers believe that serotonin plays a crucial role in regulating mood and behavior.
研究人员认为，血清素在调节情绪和行为方面起着至关重要的作用。