One of the best ways scientists have to prove cause and effect in medicine is to conduct a randomized controlled trial, in which study subjects are randomly assigned to two groups.

证明药理和药效的最好方法之一就是进行随机临床对照试验，在这个试验中其研究对象会被随机地分成两组。

youdao

METHODS: a randomized controlled trial was adopted.

方法：采用随机对照试验。

youdao

Women at risk of premature delivery were assessed for entry into a randomized controlled trial of repeated courses of corticosteroids (ACTORDS).

将有早产倾向的妇女纳入重复类固醇激素疗程的随机对照组。

youdao

The treatment was common until a randomized controlled trial proved it was actually harming women.

FORBES

The Cambridge group will begin a randomized controlled trial next month with 104 children involved, similar to the peanut study done already, but with controls, said researcher Dr. Andrew Clark of Cambridge University Hospitals.

CNN: 'Exciting' advance reported in peanut allergy therapy

Because the Framingham Heart Study is not a randomized controlled trial, it's still not clear if vitamin D is the real reason for the link (the vitamin's levels could drop in unhealthy people for other reasons), or if taking a supplement would lower the risk.

CNN: Vitamin D may be essential for heart health