| 释义 |
气旋qìxuán直径达数百公里的空气旋涡。旋涡的中心是低气压区,风从四周向中心刮。气旋在北半球以逆时针方向旋转,在南半球以顺时针方向旋转。气旋过境时往往阴雨连绵或降雪。{cyclone; atmospheric system characterized by the rapid, inward circulation of air masses with a diameter of hundreds of kilometres around a low-pressure centre, usu. accompanied by stormy, oft. destructive weather. Cyclones circulate counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere. A cyclone oft. brings continuous rain or snow in its wake.} |