英语俚语“mechanical placebo”的翻译、释义、用法及例句-英语俚语辞典

俚语	mechanical placebo
释义	mechanical placebo An impressive looking device or scheme, that in fact, does nothing. It is commonly believed that pedestrian controlled traffic signals and signs warning that police monitor speeders by aircraft, are blatant examples. Why are you pushing the "close" door on this elevator? It's just a mechanical placebo.
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