They start practising such changes at around 18 months.

他们在18个月左右开始练习这种变化。

youdao

How did such changes come about?

这种变化是怎么来的？

youdao

Studies observing such changes go back decades.

对这种变化的观测研究可回溯几十年。

youdao

They say such changes are events that have always happened.

VOA: special.2010.01.19

In fact, temperature is such a carefully controlled parameter that when it changes just a little bit by a couple of degrees, we know that something's wrong.

事实上,体温被控制得如此精细,哪怕只改变几度,我们就能感觉出来不对劲

耶鲁公开课 - 生物医学工程探索课程节选

That - irreversible changes happen all the time too but here I'm talking about very subtle small changes where you're changing the structure of the protein but only a little bit such that it can go back.

这种不可逆的改变时时刻刻都在发生,但我在这里想讲的是,对蛋白质结构进行微小的改变,小到这种改变是可逆的

耶鲁公开课 - 生物医学工程探索课程节选

Such changes, however, require a re-evaluation of the values that now drive the green movement.

FORBES: The Green Movement's People Problem

Will it be possible to document the quantity and gravity of any such changes?

CENTERFORSECURITYPOLICY: Freedom Flame 2013

But we do know that such changes in style leadership have invariably occurred in the past.

FORBES: About John "Jack" Bogle