placebo相关的词根或词缀是: plac

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Ten received stem cells and four received a placebo .

十名病人接受干细胞治疗，四名病人接受安慰剂治疗。

A second group were given a tea-flavoured placebo .

而对照组的饮料是与茶味道相近的安慰剂。

And a third group received a placebo .

第三群人吃的则是安慰剂。

In the placebo group , seventeen percent had these ulcers .

在安慰剂组，17%的人有这些溃疡。

It was only a placebo , a harmless substance .

它仅仅是一组服用安慰剂，一种无害的物质。