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placebo-controlled trial
联合国, 艾滋病	ensayo con testigos tratados con placebo
英语 词库
placebo-controlled trial
医疗的	A type of clinical trial. In placebo-controlled trials, one group of participants the control arm receives an inactive drug or other intervention, called a placebo, while another group of participants the experimental arm receives the active drug being tested. The two groups are compared to see if the drug is more effective than the placebo. 亦见 placebo