A recent study suggests that vitamin E supplements, despite widespread belief in their efficacy, are no better than sugar pills for delaying the onset of the degenerative disease.

最近的一项研究表明，尽管人们普遍相信维生素 E 补充剂的功效，但在延缓退行性疾病发病方面，维生素 E 补充剂并不比糖丸效果更好。

youdao

But there are still many questions about both their safety and their efficacy.

但人们对它的安全性和功效仍然有很多疑问。

youdao

The internet is crowded with testimonies of their efficacy and helpful intervention.

网上关于他们的效能和助益的证据随处可见。

youdao

So the Qassams may be primitive, but almost their very primitiveness increases their efficacy.

NPR: Gaza Rockets Challenge Israeli Security

Central banks that have lowered rates to nearly zero are now using unconventional, quantitative tools, but their efficacy is unproven.

ECONOMIST: Inflation is bad, but deflation is worse

"For the four others investigated, there are no published randomised clinical trials to support their efficacy in weight loss, " Dr Cable added.

BBC: Slimming pills: Do the claims add up?