Ubjects typically know they are getting some kind of treatment, and so we may rarely be able to measure the actual effects of a drug by itself.
人们普遍感觉到有了疗效，这样我们就很不好确定一种药物本身的实际疗效。
Ubjects typically know they are getting some kind of treatment, and so we may rarely be able to measure the actual effects of a drug by itself.
人们普遍感觉到有了疗效，这样我们就很不好确定一种药物本身的实际疗效。
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