Then you have less moisture to help clouds form, nothing to evaporate for cloud formation.

这样一来，帮助云层形成的水分减少，没有什么可以蒸发以形成云层。

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They combine with dust particles from the comet to form a huge cloud.

它们与来自彗星的尘埃颗粒结合在一起，形成了巨大的云团。

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Tornadoes form when winds blowing in different directions meet in the cloud and begin to turn in circles.

VOA: special.2009.06.09

These ions are thought to help create new particles called aerosols and, when aerosols grow above a certain size, they become the seeds around which cloud droplets form.

ECONOMIST: Climate change: Bubbling up | The

Of the companies surveyed, 54 percent have implemented some form of cloud computing.

FORBES: Written by Brad Reinboldt

The report findings indicate that the majority of U.S. businesses are now using some form of cloud computing for IT.

FORBES: The Cloud Hits the Mainstream: More than Half of U.S. Businesses Now Use Cloud Computing