active comparator
... action letter 决定 active comparator 活性药物对照组 active control = AC 阳性对照，活性对照 ...
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正如一位评论人员所指出，该研究并未包含活性药物对照组，且持续时间相对较短。
As an editorialist noted, the study did not include an active comparator and was relatively short in duration.
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