当雨云移动时，降雨的化学成分略有变化。
The chemical composition of rainfall changes slightly as raid clouds move.
降雨的化学成分随着雨云的移动而发生轻微变化。
The chemical composition of rainfall changes slightly as rain clouds move.
天边出现了暴雨云。
大型热带雨林的湿气有助于雨云的形成，而这些雨云会飘到需雨国家。
The humidity of large rainforests contributes to the formation of rainclouds that may travel to other countries in need of rain.
迫使雷雨云应要求放出闪电的想法并不新鲜。
The idea of forcing storm clouds to discharge their lightning on command is not new.
积雨云和积云是云中最神奇的类型。
Cumulonimbus, along with cumulus, are the most dramatic types of cloud.
一朵积雨云所含的水有多重呢？
烟雾阻止雨云形成，火焰于是越窜越高。
It also stops rainclouds forming, so the flames burn higher.
我让我的仆人去寻找雨云，但没有找到。
电荷在积雨云中聚积起来就会触发闪电。
It is triggered when electrical charges build up in storm clouds.
当雷雨云笼罩了风筝之后。
这些壮丽的冷氢云颇似夏日午后的积雨云。
These great clouds of cold hydrogen resemble summer afternoon thunderheads.
为什么滚滚的天雷，黑色的暴雨云能够产生闪电？
Why do the roiling, black clouds of a thunderstorm produce lightning?
让我们先从一团很普通的蓬松的白色积雨云算起。
Let's start with a very simple white puffy cloud - a cumulus cloud.
没有风雨云层。
不光是作物，就连农民的家庭收入和营养也全赖那些雨云。
Not only crops, but also family income and nutrition are at the mercy of rain clouds.
他找了七次，终于找到了：“有一片雨云正在海面形成！”
On the seventh time, he told me "There us a cloud rising from the sea!"
突然之间，狂风大作，晴朗的天空因为暴风雨云而暗下来。
Suddenly, the wind started blowing, and the clear sky blackened with storm clouds.
他们曾经惊异地注视着闪电在雨云密布的天空上展现耀亮的图案。
Men have gazed in wonder at the bright patterns of lightning in storm clouds.
高积云是紧紧地交织在一起的小积云。这些雷雨云常常使大地一片昏暗。
Altocumulus clouds are small cumulus clouds that are knitted tightly together. These storm clouds often darken the land.
天空要么全阴，要么就是蔚蓝的天空上孤零零飘着一朵云，而那朵云也是雨云。
Either the sky is completely overcast, or the sky is blue with one single cloud and that cloud is raining.
在这一阶段，我着重天空的刻画，通过添加一些雨云来制作些戏剧性和趣味性。
At this stage, I put more work into the sky adding some storm clouds to create both drama and interest.
这些辛普森称之为“热塔”的积雨云，对于热带海洋上暖湿的上升空气起着烟囱一样的作用。
These cumulonimbus clouds, which Simpson called "hot towers," act like chimneys for the warm, moist air rising from the tropical oceans.
他仅仅看了它几秒便被一片雷雨云挡住了视野。接着飞船便沉入一片灰色阴暗天空。
He sees it for only a few seconds before a thunderhead blocks the view, and the shuttle plunges into gray murk.
最近降雨云增多——可能是人工干预的结果——增强了人们对雨季终于来临的希望。
Recent cloudbursts – some precipitated by weather-modifying techniques – have raised hopes that the rainy season may finally have arrived.
那么一块儿比“蓬松的”积雨云大10倍的暴风云中含有的水相当于多少只大象呢？
So how many elephant units of water are inside a big storm cloud … 10 times bigger all the way around than the "puffy" cumulus cloud?
气象部门的发言人说，“只有在大面积的积雨云汇聚的时候，这么强大的暴风雨才会出现。”
A spokesman for the Met Office said: 'Storms of this intensity only occur with large towering cumulonimbus clouds.'
气象部门的发言人说，“只有在大面积的积雨云汇聚的时候，这么强大的暴风雨才会出现。”
A spokesman for the Met Office said: 'Storms of this intensity only occur with large towering cumulonimbus clouds.'
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