So that's the key thing to-- to realize; that what the assignment did was have two separate paths to the same object.

认识到赋值会造成两个独立的绑定到;,同一对象上这件事情很关键,因此我可以通过这一条或者。

麻省理工公开课 - 计算机科学及编程导论课程节选

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。

麻省理工公开课 - 热力学与动力学课程节选

That's the some of delta u in these two paths and if we look at delta u in just path A, it's zero.

这是这两条路径△U的和,如果我们要看路径A的△U，它也是零。

麻省理工公开课 - 热力学与动力学课程节选