作用力等于反作用力，这是牛顿第三定律，因此Fij与Fji完全相等，但它们方向相反。
Actions equals minus reactions, according to Newton's Third Law, so this force, Fij, will be exactly the same as Fji, except in the opposite direction.
激光推进是利用高能激光与工质相互作用产生的反作用力推动飞行器前进的一种新概念推进技术。
Laser propulsion, which works on the counterforce generated during the interaction between high-power laser and propellant, is a new concept technique for propulsion.
利用作用力做功和反作用力做功的代数和与参照系的选择无关这样的结论，计算质点组的内力作功之和将非常简捷方便。
The sum of work of effect and reaction has nothing to do with the choice of criterion. With this conclusion, it is very easy to work out the sum of particle and work of internal force.
语言结构隐含两种基本力：作用力与反作用力，它们分别包括一系列力倾向。
Linguistic structures suggest two types of basic forces: agonist and antagonist that include a series of force tendencies.
答：两个物体之间的作用力与反作用力总是大小相等，方向相反，作用在同一直线上。
The force between two objects and reaction, always also in the same line, equal and opposite direction.
答：两个物体之间的作用力与反作用力总是大小相等，方向相反，作用在同一直线上。
The force between two objects and reaction, always also in the same line, equal and opposite direction.
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