Fortier says that might force Democratic congressional leaders to pull back a bit on their reform plans when they come back to work next month.

VOA: standard.2009.08.12

Even in the case of this spring, when you pull it, if you pull it to the right by some force.

甚至是在这样的弹簧问题中,当你拉它的时候,如果你用力向右拉

耶鲁公开课 - 基础物理课程节选

I draw a graph here of the amount by which I pull the spring versus the force it exerts.

我在这里画个图,纵轴是弹簧的拉伸量,横轴是力的大小

耶鲁公开课 - 基础物理课程节选

They seem to be going somewhere and there's this sort of force of pull or gravity in music having to do with some chords wanting to go to other chords.

和弦向某一个方向发展，就像有一股力量拉着它们,或者说音乐的重力吸引着它们，让一些和弦想行进成为另一些和弦。

耶鲁公开课 - 聆听音乐课程节选

We want to know how much force it exerts when I pull it by a certain amount.

我们想知道当我们将弹簧拉伸一定量时,它能产生多大的力

耶鲁公开课 - 基础物理课程节选

Namely, if you pull it by so much, that's the force it will exert.

也就是,将弹簧拉伸这么长,它产生的力就有这么大

耶鲁公开课 - 基础物理课程节选

In daily life, everything seems to come to rest unless you push it or you pull it or you exert some kind of force.

在日常生活中,一切物体都会停下来,除非你去推它,或者拉它,或者施加某种外力

耶鲁公开课 - 基础物理课程节选

If you pull the spring, there is a force acting on it.

如果拉这个弹簧,就有力作用在物体上了

耶鲁公开课 - 基础物理课程节选

For example, how do I know that when I pull the spring the first time for the mass, it exerted the same force when I pulled the spring the second time for the elephant?

例如 怎样才能知道,第一次连着物体拉弹簧时,产生的力和,第二次连着大象拉弹簧时产生的力是相等的呢

耶鲁公开课 - 基础物理课程节选

It says, if you pull it to the right, so that x is positive, the spring will exert a force which is in the negative direction; that's why you have a minus sign.

就是说,如果你向右拉,x 取正值,弹簧产生的力方向为负,这就是这里用负号的原因

耶鲁公开课 - 基础物理课程节选