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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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.

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The change in later stage deals is even more pronounced.

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

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