目的：应用双盲安慰剂对照的客观评估方法观察褪黑素对老年原发性失眠患者的治疗作用。
AIM: to observe the effect of melatonin in treating elderly patients with primary insomnia by using the objective evaluating method of double blind placebo control.
但是，在1979年和1985年，两项双盲安慰剂对照临床实验的研究者报道说肿瘤患者口服高剂量的维生素C没有收到治疗作用。
In 1979 and 1985, however, other researchers reported no benefit for cancer patients taking high oral doses of vitamin C in two double-blind, placebo-controlled clinical trials.
答案是“金标准”，双盲，安慰剂对照研究。
The answer is the "gold standard" double blind, placebo controlled study.
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