If I make the spring twice as long, I would get double the extension, because when I have two springs in series, each one, under the influence of this force, will get longer by this amount.

若弹簧长度加倍，拉长刚才的两倍，当我把两个弹簧串联，任何一个弹簧，在这个力的作用下，将会拉长相同的量。

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The paper introduces the main structural features and technical characteristics of air springs used on double-deck passenger coach.

本文介绍了双层客车用空气弹簧装置的主要结构特征和主要技术特性参数。

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Suitable for producing double twist spring, straight spring, pagoda-shaped draught spring, rectangular spring, wires with various shapes, volute spring and other special-shaped springs.

用于生产双扭簧、形簧、塔拉簧、形簧、材成形、皮涡簧及各种花式簧、形簧等。

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Whilst transporting your white-shoe friends out to East Egg, the Panamera GTS glides serenely on its air springs (double wishbones in front, multilink rear).

WSJ: 2013 Porsche Panamera GTS Review: The Car for Today's Jay Gatsbys? | Rumble Seat by Dan Neil

Sprung with double wishbones, coil springs and adaptive monotube dampers, the car offers a choice of three drive modes Tour, Sport and Track with escalating thresholds for the car's engine, transmission, suspension and stability logic.

WSJ: 2014 Aston Martin Vanquish Review: No, Mr. Bond, I Expect You to

Stanley invented a double-brake system using two brake shoes supported by springs that clamp down on a disc.

FORBES: Stan Bogdan: Remembering a Fly Fishing Giant