只有一种反作用力，那就是你，山姆大叔。
Only one counterforce was available, and that was you, Uncle Sam.
反作用力把人造卫星送入轨道。
其反作用力F’为物块对人施加的力。
The reaction is the force F'exerted by the block on the man.
还有一个例子证明作用力,与负反作用力相等。
That's another example where you see action equals minus reaction.
每一种作用力都有一种与之等量的反作用力。
Every kind of input strength has a reverse strength which is as big as it.
然而如果遇上足够强大的反作用力，经济动力将会迅速消失。
Yet economic momentum is quickly dissipated if it meets strong-enough counterforces.
第三个定律说每一个作用力都有相等的反作用力。
The third law said that every action has an equal and opposite reaction.
从物理中我们知道每个作用力都有它的反作用力。
From physics we know that for every action there is an opposite reaction.
这个作用力所产生的反作用力推动宇宙飞船前进。
The reaction force to this action force pushes rocket ship along.
把表面粗糙化也可能是减小飞机反作用力一个办法。
There may also be a way to cut aircraft drag by making some surfaces less slippery.
也许用玩具气球的情况最容易说明这种反作用力。
It is perhaps easiest to understand the reaction in the case of the toy balloon.
每一个作用力都会引起相等的和相反的反作用力。
其包含了三种情况：作用力与反作用力都不做功；
It contains three situations: both of force and reaction do not work;
任何事物都处在一对相反作用力之下，且处于平衡状态。
Everything is in a pair of opposite forces and in a state of equilibrium.
每一个作用力都有一个大小相等、方向相反的反作用力。
作用于物体上的力会受到大小相等、方向相反的反作用力。
A force which ACTS on an object is opposed by an equal and opposite reaction.
如果这种情况是正确的，那就意味着进化的核心存在反作用力。
If this picture is correct, it means that there are opposing forces at the heart of evolution.
通过螺杆回转，熔体聚集于料筒前部，反作用力使螺杆后退。
Screw Rotation Feeds and Shears Material Into a Melt. Melt Collects Into Front of Barrel, Forcing Screw Back.
除了某特别情况之外，所有动作应以一个向后的反作用力作开始。
All movements must begin with a backward motion with a very few exceptions.
因为力一向是两个物体间的交互作用，枪施予球推力，球施予枪反作用力。
Since forces are always an interaction between two objects, the gun pushes on the ball and the ball pushes back on the gun.
至少有一些咒语表现得像自然能量，包括力、反作用力等在自然物体中可看到的力量。
Spells, at least some of them, behave like physical energy, with forces, counterforces, and vectors much like those seen in physical objects.
反作用（二级）力：当物体反抗原始力的影响时，惯性和动力的效果便是反作用力。
Reacting ( Secondary ) Forces: the evidence of the effects of inertia or momentum in the body as it reacts to the influence of the Initiating Force.
结果：描述、分析了完整起步过程各步相的特征以及地面对足的三维反作用力规律。
Result: Gait characteristic and foot-ground reaction forces in initiation from standing at rest to the heel-contact for the second time was analyzed.
也就是说，对于任一物体或表面施加的作用力，该物体或表面必会产生相同的反作用力。
That is, for every force applied to an object or surface, that object pushes back with equal force.
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.
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.
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