The key lies in producing enough great driving force of natural circulation at reasonable heating temperature difference to make masted tape self-rotate reliably in heat transfer tubes.

其关键是能否在合理的加热温差下产生足够大的自然循环推动力，足以带动自动清洗螺旋扭带可靠地自转。

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Creating common circulation Spaces that encourage or even force workers to interact on their way to their desks is another means by which companies attempt to enhance workplace culture.

创建常见的流通空间刺激甚至迫使工人们在他们去办公桌的路上与他人互动，这是公司试图去加强工作场所文化的另外一种方式。

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The infrared ray warms up the magnetic force treatment, ameliorative blood circulation, instauration physical strength.

红外线温热磁力治疗，改善血液循环，恢复体力。

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Unfortunately, because of the nature of air circulation, any downward-pointing force created aerodynamically generates a backward-pointing resistance in the process just as an increase in the lift of an aircraft wing as the flaps are lowered for take-off or landing creates more drag in the process, forcing the pilot to open the engine throttles to overcome the extra wind resistance.

ECONOMIST: CAR DESIGN