Clinicaltrials take a long time because they're rigorously controlled, with close attention paid to sampling bias and methodology.
临床试验需要花费很长时间,因为它们处于严格控制之下,必须密切留意取样偏差与方法。
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Much of the research on alcohol's benefit comes from studies that observe people over time rather than from controlledclinicaltrials, which are more reliable.
Take, for example, those 19 million studies on PubMed.Some are gold-standard research: large, randomized, controlledclinicaltrials or meta-analyses that carefully parse millions of data points.