The chemical composition of rainfall changes slightly as rain clouds move.
降雨的化学成分随着雨云的移动而发生轻微变化。
Janet watched the rain clouds darken the sky.
珍妮特看着乌云将天空变暗。
They hastened the pace when they saw rain clouds .
他们看见乌云便加快了脚步。
The thick nitrogen atmosphere holds fog, mist, smoggy haze and rain clouds.
厚厚的氮气组成的大气层你弥漫着烟雾和云。
Not only crops, but also family income and nutrition are at the mercy of rain clouds.
不光是作物，就连农民的家庭收入和营养也全赖那些雨云。
Weston-super-Mare, England: Rain clouds gather above the big wheel on the seafront.
英格兰滨海韦斯顿：雨云在滨海的摩天轮上集聚。
Form of visible electric discharge between rain clouds or between a rain cloud and the earth.
闪电，是一种在雨云之间或者雨云与地球之间肉眼可见的放电形式。
She has been firing rockets with special chemicals at rain clouds to see if she can create precipitation.
她已经在试验发射带有特殊化学药品的火箭尝试人工降雨。
I don't like the look of those rain clouds and think we should return home while the going is good, before it rains and we get soaked.
我讨厌好些雨云，我想我们应该在天还未下雨，我们还没被淋湿以前及时赶回家。
The sky was adorned with rain clouds. The eucalyptus tree in the garden swayed with joy and the air was filled with the sweet smell of wet mud.
天空乌云密布，花园里的桉树欢快地摇曳着，空气中弥漫着甜甜的湿土的气味。
How rain clouds become charged is not fully understood, but most rain clouds are negatively charged at the base and positively charged at the top.
雨云是怎样被充电尚未完全被了解，但是大部分的雨云在底部充以负电在顶部充以正电。
Meanwhile, radio newscasters were just beginning to track a promising swirl of rain clouds moving over the Andaman Islands, off the southeast coast.
就在此时，新闻播音员们刚刚开始追踪报道一团从东南海岸向Andaman安达曼群岛引动的降水云系。
He thought of how beautiful the rain clouds were, how happy he was to have a car to sit in, how happy he was to have eaten pancakes for breakfast, etc.
他想起雨云是多么的漂亮，他有一辆轿车坐着是多么高兴，有薄煎饼做早餐吃他是多么的幸福，等等。
He had not chosen a nice day for a dinner party, he thought, and wished he could have pressed blotting paper against the pale rain clouds to dry them up.
他想这请客日子拣得不安全，恨不能用吸墨水纸压干了天空淡淡的水云。
THE Rwenzori mountains straddling Uganda and Congo are dark green and shrouded in rain clouds and mists which part only rarely to reveal dazzling equatorial glaciers.
鲁文佐里山横跨乌干达和刚果，郁郁葱葱，云雾缭绕。其顶峰熠熠发光的赤道冰川笼罩其中，难得一见。
Groundwater's contribution to sea-level rise will probably diminish, he added, because as groundwater basins are depleted, there won't be as much water left to send through rain clouds to the oceans.
他补充说，地下水对海平面上升的作用将可能减少，因为随着地下水盆地的枯竭，将不会有多少水通过雨云进入到海洋中。
THE rain clouds have gathered in liquid grey over the wetlands of the Sudd, the vast swamp that oozes either side of the White Nile as it curls through the heart of the new state of South Sudan.
白尼罗河蜿蜒穿过新成立的国家南苏丹，两岸广袤的苏德沼泽翻滚着泥浆。
Yes, water makes clouds and clouds bring us rain.
是的，水制造云，云为我们带来雨。
Rain comes from clouds. There are many kinds of clouds.
雨来自于云，云的种类有很多。
乌云密布预示大雨将至。
Then the cycle continues, less rain, drier soil, less vegetation, fewer clouds, less rain etc.
然后这个循环继续下去，雨水减少，土壤变干，植被减少，云层减少，雨水再减少等等。
As you might have guessed, the clouds did mean rain.
你可能已经猜到了，这些云确实意味着要下雨。
During floods, Thai farmers flew kites over their fields. They hoped the kites would drive away the clouds and stop the rain.
洪水期间，泰国农民在田里放风筝。他们希望风筝能驱散云层，阻止下雨。
Rosy morning clouds indicate rain, and a rosy sunset means fine weather.
早霞主雨，晚霞主晴。
Then the new clouds rain, and the oscillating pattern repeats itself.
然后新的云朵产生降雨，继续重复上面的过程。
On Titan, methane forms clouds and maybe even rain.
在土卫六上，甲烷可以形成云甚至降雨。
On Titan, methane forms clouds and maybe even rain.
在土卫六上，甲烷可以形成云甚至降雨。
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