效验的英文：
efficacy
n. 功效，效力
- feeling of efficacy
效力感 - The efficacy of the medicine is satisfactory.
这药的药效令人满意。 - Saturation does not increase efficacy.
饱和剂并不增加疗效。 - The efficacy of this intervention has not been determined conclusively.
这种干预的功效尚未最后确定。 - Because it has the same efficacy as operative knife.
因为它能起到手术刀一样的效果。