he noticed that the level of the melatonin in the blood of these subjects went down.subjects指什么
问题描述：
he noticed that the level of the melatonin in the blood of these subjects went down.subjects指什么
答
他注意到这些个体血液里的褪黑激素的含量下降了. Subjects 是试验里的个体,可以是人,动物等等.