Now, suppose I took this two paths, and I took -- couple them together with one the reverse of the other.
其中一条的方向反过来,这是初态,末态,路径1,先冷却。
And, if you ever get confused, the way to remember these is that you know energy is the integral of a force moving through a distance.
如果你感到很困惑的话,可以这么来记,能量是在沿力的方向进行路径积分。
Energy is the integral of force moving through a distance.
能量是在沿力的方向,进行路径积分。
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