Hail clouds were classified 6 kinds according to scale: thunderstorm cloud, convective cloud, mesoscale convective system, cold-cloud-nuclei, cloud field of system clouds, and edge of cloud cluster.

按尺度大小将降雹云团分为雷暴云、对流云、中尺度对流系统、冷云核、系统云系云区及云团边缘6类。

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I think it has a cool little message; that no matter how dark the cloud is above you or how cold the rain, there is hope that things will pass and stuff gets better.

我认为它表达了一条非常酷的信息，那就是无论你头上的乌云有多黑暗或雨有多冷，仍然会有一份希望：一切不如意都将过去，事情也会变得更好。

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The lava flows down the mountain to the Pacific Ocean. Its fierce heat produces a big cloud of steam when it hits the cold water.

火山岩从山上流下，进入太平洋，它那极高的温度与冷水相遇形成了一个巨大的蒸汽雾。

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The railway is a Soviet triumph of man over nature, built in an inhospitable land of extreme winter cold and mosquito-cloud filled summers.

BBC: A train to nowhere in Siberia