(meteorology) rapid inward circulation of air masses about a low pressure center; circling counterclockwise in the northern hemisphere and clockwise in the southern
a violent rotating windstorm
造句
An experimental investigation was made of the pressure drop ratio characteristics of oil-removing cyclones in a room bedstand. 在室內試驗裝置上對單錐除油型水力旋流器的壓降比特性進行了試驗研究。