The drag force decreases with decreasing of the surface area between the hull and water.

拖曳力的下降，下降的表面积之间的船体和水。

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Decreasing the particle size is usually conducted by applying a shearing force.

通常使用剪切力减小颗粒粒度。

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In the compound process of ultrasonic vibration and grain machining, the discontinuous grinding mechanism caused by ultrasonic vibration is the main factor decreasing normal grinding force.

深入研究了超声振动和磨粒切削的复合过程，指出超声振动形成的断续磨削机制是降低法向磨削力的主要原因。

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But as the UK has got safer and healthier, the force-of-mortality has been decreasing for decades, so that life expectancy has been rising at about three months a year - it's odd to think we have been essentially ageing only nine months for each year that passes.

BBC: Will I live longer than my cat?