cloudiern.人造云cloudn.云；阴影cloud and air water resource空中云水资源Clouds floated in the sky.云漂浮在空中。clouds massing on the horizon地平线处积聚的云彩cloud microphysical parameter云相态Clouds are greying the sky.云层使天空灰暗。Cloud flutter by your side.白云掠过你的身边cloud chamber smoke detection云室感烟探测cloud-to-ground lightning云地闪Clouds blotted out the sun.云遮住了太阳。clouds sailing across the sky飘过天空的云彩