It swirls, as circular motion in air masses is the response to conflicting forces, as seen in the circular motion of tornadoes and hurricanes.

就如我们所看见的龙卷风和飓风进行着圆形运动，由于气团应答着相互冲突的力量，大气层也在进行旋转运动。

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Cost Effective Operation. This equipment saves more than 30% energy than pulse jet circular baghouse as it does not need air compressors.

运行费用低。 本设备更节能，不需要空压机等气源供给设备， 比脉冲反吹圆布袋除尘器节能30%以上。

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The relationship between the onset of CVD and meteorological factors including temperature, air pressure, relative humidity, wind velocity was analyzed by circular distribution analysis,.

圆分布分析脑血管病发病的季节规律；直线相关、多元逐步回归分析气象因素与脑血管病发病之间的关系。

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U.S. and British airstrikes have cut off the Taliban air supply routes to the north, leaving the Taliban only a long circular route through western Afghanistan to supply the north, Abdullah said.

CNN: Northern Alliance: Taliban supply route cut

The intervening weeks will be spent in a manoeuvre called aerobraking, which involves using the air-resistance of the thin Martian atmosphere to change the elliptical initial orbit into a circular one from which the planet's surface can be examined in detail.

ECONOMIST: Mars Odyssey