So if we added those two energies together to get the sum of the two,

如将两个弹簧的能量图线相加
on this central particle, it looks like that.

就会得到这样一条曲线
So there's a balanced minimum.

这里存在一个能量最低的平衡点
There's a well defined position

这是很重要的一个位置
where the particle in the center of this chain

处在两个弹簧之间的粒子位于这一点时
will just sit there and it'll be hard to displace.

很难被移动
So it can vibrate.

粒子会以这点为中心震动
Now how about in the other case?

右边这幅图又会怎样呢
How about if it were electrical charges or gravity or something like that,

如果是像电荷间作用或是重力
an inverse square law that's holding things together?

那些与距离平方成反比的力呢
Then the second one is going to look like that,

这是我画出来的第二条线
and that one is indeed stronger.

第二个体系的作用将会更强