All this has been demonstrated in elaborate experiments.

所有这些都在精心设计的实验中得到了证明。

youdao

It has been demonstrated that this drug is effective.

这药已证实是有效的。

《牛津词典》

That has been demonstrated in creatures ranging from worms to mammals.

据称, 从蠕虫动物到哺乳动物都适用于此说法.

youdao

But the power of this river has been demonstrated in more modern times.

VOA: special.2009.08.12

As has been demonstrated in Europe, putting government price controls on medicines dries up innovation.

FORBES: Magazine Article

The failure of defensive stocks to protect portfolios has been demonstrated over and over again.

FORBES: Defensive Stocks Are Losers In Corrections, Too

The determination of Tunisian women has been demonstrated outside the legislative chambers as well.

CNN: We cannot fail the women of Arab Spring