On one hand, it's a placebo effect.

一方面，这是一种安慰剂效应。

For centuries, doctors have recognised the placebo effect, in which the illusion of treatment, such as pills without an active ingredient, produces real medical benefits.

几个世纪以来，医生已逐渐认可了安慰剂效应。因为患者会产生错觉，认为自己在接受治疗。比如，服用无活性成分的药片也能产生实际疗效。