安慰剂效果证据充分。
The placebo effect's been well-documented.
youdao
事实上,尽人皆知,安慰剂效果难以识别,衡量,以及被清晰地界定。
Indeed, the effect is famously difficult to identify, measure, and even coherently define.
文件记载表明,安慰剂的效果一直良好。
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