So, that's the process of clouds forming.

这就是云的形成过程。

Sulfur dioxide is a popular molecule there, and clouds form from sulfuric acid.

二氧化硫充斥着大气，云团是由硫酸形成的。

As the warm air rises over the obstruction, it cools, and clouds form.

当暖空气上升到障碍物时，就会冷却，形成云。

Without those clouds forming, rain would be rare, and Earth would quickly become a desert almost everywhere.

如果没有这些云层的形成，雨水就会变得很少，地球几乎所有地方都会变成沙漠。

Like everyone else at the time, he had no idea how clouds formed, or how they stayed aloft.

和那时所有人一样，他不知道云是怎样形成的，也不知道云怎么能漂浮在空中。

So how do clouds form to keep giving us the essential H2O we need?

那么，云是如何形成并持续提供我们所需的水的呢？

As water vapor cools, it condenses, and clouds form.

随着水蒸气冷却， 它凝结，形成云。

And who decides what makes a cloud form unique?

谁决定云形态的独特性？

The clouds of bourbon vapor forming them.

是您呼出的气儿变成波旁酒云飘来了。

A few clouds formed briefly before dissolving again.

【dissolve】一些云朵聚积了一会儿然后又消散了。

The people did  not understand that the cloud forming above the mountain was the beginning of their doom.

人们不明白山上形成的云是他们厄运的开始。

She told Reuters news agency she fled her home with only two sets of clothes after she saw a huge ash cloud form.

她对路透社说，她看到一朵巨大的火山灰云后，只带了两套衣服就逃离了居所。

Clouds formed this way are called cumulus clouds, or cumulonimbus clouds, and they usually lead to very heavy rain, often with thunder and lightning.

这样形成的云被称为积雨云，它们通常会导致大雨，还经常伴有电闪雷鸣。

Though Dr Russell's experiment had been designed mainly to look at how clouds form naturally, it paves the way for future work on geoengineering.

拉塞尔的实验是为观察云朵的自然形成而设计，在此也为更多地理工程研究铺路。

As the warmer air rises over the cold air it also starts to cool, condensation occurs, and the cloud forming process begins, leading to rain.

随着暖空气上升到冷空气上方，它也开始冷却，出现凝结现象，云开始形成，导致降雨。

Relief rain is common in mountainous areas where it can lead to more extreme local rainfall patterns, because the rain clouds form very quickly.

地形雨在山区很常见，它可以导致更极端的局部降雨，因为雨云形成非常快。

That air flows to the sides and sinks, and sunlight changes the chemistry in the clouds forming molecules that color the air yellow, red, and brown.

当气流涌向边缘并下沉时，阳光会改变云团中的化学成分，产生把云团染成黄色、红色和棕色的分子。

Clouds form when saturated air reaches  its dew point, the temperature at which, under a given set of barometric conditions, water  vapour condenses into liquid due to cooling air or increased saturation from an adjacent water  source.

当饱和空气达到露点时， 云就会形成。露点是在给定的气压条件下，水蒸气由于冷却空气或邻近水源饱和度增加而凝结成液体的温度。

" Asperitas, " which translates to " rough and uneven, " is one of the rarest cloud forms  on record – and the only one to have been formally added to the WMO's Cloud Atlas in almost  70 years.

“Asperitas” 的意思是“粗糙和不均匀”，是有记录以来最罕见的云形态之一， 也是近 70 年来唯一被正式添加到 WMO 云图的云形态。