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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When Cloud covers my face, the world grows cold.

当云遮住我的脸时，世界就会变得寒冷。

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Then the researchers nudged this cloud of cold, compressed antiprotons so it overlapped with a like-size positron cloud, where the two particles mated to form antihydrogen.

然后研究人员推动这个冷却的云斑，并进一步把反质子压缩，以致可以用一个相似大小的中子云来与它相重叠，就在那时，两个粒子（反质子和中子）成对地形成了反氢原子。

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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