1. 烟云柱：cloud chamber photograph 威尔逊云室照片 | cloud column 烟云柱 | cloud track 云迹
2. 雲柱：cloud cluster 雲簇 | cloud column 雲柱 | cloud condensation nuclei 雲凝結核
1. Tornado is a column of air revolving rapidly and reaching the Earth, which is caused by cumuliform cloud.