在临床试验中，一半的参与者服用了新药，另一半则只服用了安慰剂。

In the clinical trial, half of the participants took the new drug while the other half received only a ___placebo.

研究人员发现，服用安慰剂的患者也报告了症状的明显改善。

Researchers found that patients taking a ___placebo also reported significant improvement in symptoms.