由此得出，决定井眼轨迹的是钻头合位移方向，而不必是合力方向。
The trajectory of bore hole is proved to be formed by the resultant displacement of the bit instead of the resultant force.
而这些成就的取得，绝不是由某种单一力量所决定的，而是由多种复合力量所形成的历史的合力方向所决定的。
But what these achieve obtain, anything but from what single a certain strength decide, but from various compound what the resultant force direction of history become by strength decides.
除非有一合力作用于物体上，否则物体的方向是不会发生变化的。
There is no change in the motion of a body unless a resultant force is acting upon it.
因此一条细绳施加一个拉力，朝这个方向，另一条细绳也必然施加拉力，朝这个方向，这样整个整体合力为零。
And so one string must be pulling in this direction and the other string must be pulling in this direction so that the net force on the system is zero.
其它情况下，摩擦力会根据情况调节自身,此时在x方向上使用第二定律,合力为0就是结果。
And the frictional force, in this case will adjust itself just the right way so that Newton's Second Law in the x direction will give you, for the force, a zero.
在这个和那个方向上的合力必定为零。
The summation of forces in this and that directions must be zero.
那么单摆在振动过程中，切向力、法向力及合力的大小和方向是否在变化?。
Do the tangential force, the mormal force, the resultant force and their directions during oscillation of a simple pendulum change?
该结构缺乏牙周膜组织，故应通过咬合设计控制种植义齿咬合力大小及方向对种植体加以保护。
Without the protection of periodontal membrane, we should pay more attention to the occlusion design, controlling the value and direction of occlusal force exerted on DE.
沿着纤维长度有很强结合力的共价结合在这个方向上给予复合材料很高的模量，因为要损坏或拉伸纤维就必须破坏或移除这种结合。
The strong covalent bonds along the fiber's length give them a very high modulus in this direction because to break or extend the fiber the bonds must also be broken or moved.
换句话说，因为没有竖直方向的合力，所以线动量的竖直方向仍为零。
In other words, the vertical component of its linear momentum remains zero, since there is no resultant vertical force.
整合力量，凝炼方向，加快应用数学学科建设。
Conforming faculty, condensing direction, speeding up the construction of the applied mathematics.
对动态电荷群的研究得知能够实现这种悬浮力。 较简单的情形是只要两个动态点电荷满足三个条件，它们各自受到的力就会指向同一方向，力的大小按正弦规律变化，合力不为零且稳定不变。
A simple type is that the forces on two dynamic point charges have the same direction, the scale of the forces are changeable with sine regularity and its' resultant force is stable and nonzero.
对动态电荷群的研究得知能够实现这种悬浮力。 较简单的情形是只要两个动态点电荷满足三个条件，它们各自受到的力就会指向同一方向，力的大小按正弦规律变化，合力不为零且稳定不变。
A simple type is that the forces on two dynamic point charges have the same direction, the scale of the forces are changeable with sine regularity and its' resultant force is stable and nonzero.
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