Results obtained show that reversal procedure of diagonal branch contains two stages, one is stratified flow of smoke and airflow toward different directions, which is a quantitative change stage.

实验结果表明：下行通风角联分支风流的逆转可以归结为烟流和风流异向分层流动的量变过程和风向突变的质变过程。

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A study by the University of Manchester calculated the emissions of CO2—the main greenhouse gas responsible for climate change—at every stage of microwaves, from manufacture to waste disposal.

曼彻斯特大学的一项研究计算了二氧化碳（造成气候变化的主要温室气体）在微波炉生产的每个阶段的排放量，从产品制造到废物处理。

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The process of political change in South Africa has reached the stage where it is irreversible.

南非的政治变革进程已经到了不可逆转的阶段。

《柯林斯英汉双解大词典》

We have not reached that stage yet,". New Delhi and Beijing signed an agreement in October to jointly work on climate change and stand united at the Copenhagen conference.

VOA: standard.2009.11.27

As Mr. Obama made his international debut on the world stage, an unmistakable change in tone and attitude emerged about how the United States will deal with the rest of the world.

VOA: standard.2009.04.03

But he said he did not "recall" any conversations with British ministers or policy discussions in Whitehall about regime change at that stage.

BBC: Iraq inquiry told of 'clear' threat from Saddam Hussein

The change in later stage deals is even more pronounced.

WSJ: Shining a Spotlight on Venture Capital

All is well with Apple for a company in the fourth stage of change.

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