Through an analysis of the forces acting on a weft which is inserted by air-jet in a loom, a differential equation of weft flying movement is estabilislied.

本文通过对喷气引纬过程中气流对纬纱作用力的分析，建立了纬纱运动的微分方程。

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Differential stress is commonly produced when external forces act on a given solid body. It may cause deformation of crustal materials and generate various kinds of structural features.

另一部分是差应力，固体中受外力作用普遍产生差应力，它引起地壳物质变形，产生各种构造形迹。

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The differential deformation between vertical structural members of the Shanghai Tower can cause secondary internal forces in horizontal structural members.

上海中心大厦在长期荷载作用下结构竖向构件间的差异变形会在水平构件中产生较大的次内力。

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Mathematical models are used to simulate the rest of the car, from the gearbox and rear differential to the force exerted by the road, so that the engine is subjected to the same demands and forces as it would be in a real car.

ECONOMIST: Car design