or a thing on a spring to behave. Okay?

或者连在弹簧上的物体
This is not normalized.

这不是归一化
But notice something else that's really valuable here,

但是请注意这里有一些东西是很有意义
really crucial, which is that this line is where the potential

非常重要就是在这条线上
and the total are the same for the red curve. Right?

红色曲线的势能和总能是相同的对吗
So here is zero kinetic energy. In here the kinetic energy is positive,

这里的动能为零在这里动能是正的
out here it's negative,

这外面就是负的
and the thing can be out here. Right?

物体可以在这外面对吗
So the thing exists in a region of negative kinetic energy.

因此物体可以出现在负动能区域
There's nothing special about that. Okay?

这没什么特殊之处
It's just that that's the way things work.

只不过物体就是这么运动的
Kinetic energy can be negative. And in the case of the blue one,

动能可以为负在蓝色曲线上