The last fragment has a non-zero Fragment Offset field, differentiating it from an unfragmented packet.

最后一个片段有一个非零的片段偏移字段，将它与未碎片化的包区分开。

youdao

Well, you see, each of these guys is one of the things that have to be zero for our field to be conservative.

你看，这里每一项,场是保守的时，都是零。

youdao

And that would be fortunate because if a curl is zero then your field is less conservative.

真是十分幸运啊，因为如果旋度是0，那么场至少是保守的。

youdao

You know, if you want to measure the potential energy of something in a gravitational field, you have to define the zero somewhere, right, because it's arbitrary. You can set it anywhere you want. It's the same with enthalpy.

你知道，如果你想测量重力场,中某种东西的势能，你需要，在某处定义一个零点，对吧？,因为势能的值是任意的,你可以把它设定在。

麻省理工公开课 - 热力学与动力学课程节选

We can also do a similar thing, and I'll keep my distance from the board, but we can instead be holding x constant, for example, putting x to be equal to zero, and then all we're doing is considering the electric field as a function of t.

我们也可以做类似的事情,把x固定为一个常数,例如令x等于零，然后,考虑电场作为时间的函数,这种情况下，我们划掉。

麻省理工公开课 - 化学原理课程节选

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