This is not a small effect.

这个影响可不小。

youdao

It is a small effect.

它们确实是小的影响。

youdao

Probiotic yoghurts have only a small effect on gut bacteria.

益生菌酸奶对肠道菌群的影响微乎其微。

youdao

New Wal-Mart stores have had a big effect on small communities in the United States.

VOA: special.2009.07.17

Dr Pamela Schwartzberg said each of the steps only had a small effect but together they were significant.

BBC: HIV drug resistance target find

Contrary to received wisdom, slashing the rich world's trade-distorting subsidies has a relatively small effect on poor countries.

ECONOMIST: Weighed in the balance

So my take is: poorly done study, published in a relatively uncompetitive journal (PLoS ONE), with a small effect.

FORBES: Harvard Placebo Study Was Seriously Overhyped