The carriage is driven by a motor, which can exert on it a variable force.

小车是由一个马达控制的，它可以运用于一个变力。

youdao

The motion of variable mass system under variable force is studied using air track.

在气垫导轨上研究了变质量物体在变力作用下的运动规律。

youdao

We conclude this section with two examples of motion under the action of a variable force.

下面我们举两个关于物体在变力作用下运动的例子来结束这一节。

youdao

The small screen format and variable delivery speeds force us to think differently about the medium.

FORBES: Mobile Marketing to Fourth of July Road Trippers

Any time government tries to force one variable within a free market to a certain value or to move in a certain direction, it destabilizes every other variable.

FORBES: What Kind of Power Is the Most Dangerous?

The variable Stock and Watson ultimately cite is the decline in labor force participation, and they argue it is driven by the aging of the workforce and the overall distribution of workers by age.

FORBES: Does An Aging Population Hurt The Economy?