And if the curl is zero then it means that this force does not generate any rotation effects.
如果旋度是0，就意味着，这个力不产生旋转作用。
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.
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。
There is a catch, however. Supplying trillions of dollars of reserves and driving interest rates to zero cannot force banks to lend or companies and households to borrow.
有一个难题就是，提供再多储备，利率降得再低，也不能强制银行、公司和个人进行借贷。
On the equator the deflection force of earth rotation which acts on the objects in non horizontal motion is not equal to zero.
赤道上作非水平面内运动的物体所受的地转偏向力并不等于零。
Pressure Angle is never zero, the transmitted force always tends to push centers of the gear apart.
压力角不会是零，传动力总是倾向于把齿轮的中心分开。
To have an interference or force fit between mating parts, the tolerances must be such as to create a zero or negative allowance.
为了使配合零件之间具有过盈或强制配合，公差必须产生零或负允差。
In other words, the vertical component of its linear momentum remains zero, since there is no resultant vertical force.
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。
The centrifugal force caused by the earth's rotation decreases from a maximum at the equator to zero at the poles.
地球自转产生的离心力从赤道的最大值降低到极地的零值。
If the force P is reduced or made zero, the elastic force will restore the spring to its original unstretched condition.
如果力P减小或变为零，那么弹性力就使弹簧恢复当初的未伸长状态。
The precise critical force of a system can be deduced from the fact that the determinant of stiffness matrix of the system is equal to zero in the critical condition.
由结构刚度矩阵行列式值为零的失稳条件导出结构失稳特征方程，从而精确地确定系统临界力值。
The tangency point of Bottom Hole Assembly is located at where the drill string just touches the wall of the borehole, and the contact force is zero here.
在计算底部钻具组合的受力和变形时，以前一般都是按弯矩为零的条件来确定其上切点的位置。
The utility model provides a multi-functional neutral pen which can fluently write under the zero gravity state or when the gravity does not point to the component force of a pen point.
本实用新型提供一种多功能中性笔，使其在失重状态或重力无指向笔尖分力时也可流利书写。
Data showed that for every 100 miles on the road, elevated g-force events ranged from near zero for some drivers to as high as 50 for others.
数据显示，公路上每隔100英里，某些司机重力加速度事件出现的的次数近乎于零，而其他某些司机则高达50次。
However, criminologist Newbold argues that zero-tolerance policing is a dangerous fad that risks creating an arrogant police force because it gives police extraordinary powers.
然而，犯罪学家纽博尔德争论道，“零度宽容”的治安政策是一种危险的时尚，由于它给予了警察特大的权力，所以极易造成一支傲慢的警察队伍。
However, criminologist Newbold argues that zero-tolerance policing is a dangerous fad that risks creating an arrogant police force because it gives police extraordinary powers.
然而，犯罪学家纽博尔德争论道，“零度宽容”的治安政策是一种危险的时尚，由于它给予了警察特大的权力，所以极易造成一支傲慢的警察队伍。
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