wervelwind (zn):
tourbillon(de) Atmosphärenforschung, Meteorologie: Sturmsystem mit vertikaler Drehachse.
(en) anything involving violent or chaotic activity around some centre.
(en) whirlpool.
(zh) 流體順著某個方向環繞直線或曲線軸的區域., cyclone(en) violent windstorm of limited extent characterized by an inward spiral motion of the air.
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