So 'dS' simply means a change in entropy.

所以 dS 表示熵变。

My son never feels like getting off his DS. That's my job!

我的儿子从来不觉得 他玩够了他的任天堂，那是我的工作！

It wasLegen-- wait for it-- ds of the Fall.

那就是 燃情...来了..岁月。

Okay, okay. You know what, What ds that even prove, okay?

得了 得了 这能证明啥?

And ds is referring to each infinitely tiny section of the loop.

每一件小事都会被无限地指出 情节的一部分。

The ds in english and history, that tells us that he had difficulty reading.

英语和历史得D 说明他有阅读障碍。

And the integral of ds is just the length of side one of the Amperian rectangle.

ds 的积分就是安培矩形第一条边的长度。

And in the 1990s you had this rather interesting word 'saddo' that's the adjective sad with this 'o' ending, spelt with two ds: s-a-d-d-o.

在20世纪90年代，我们有了saddo这个词。它是由形容词 sad 加上两个 o而得来的：saddo。

Because the directions of ds for side 2 and side 4 are both at an angle of 90 degrees from the magnetic field.

因为边 2 和边 4 的 ds 方向都与磁场成 90 度角。

Looking at sides 2 and 4, we need to realize the dot product of B and ds, is the same as B ds cosine theta, Right!

观察边2和边4， 我们需要实现B和ds的点积，与B ds cosine theta相同， 对吧！

And ds is in the same direction as the magnetic field, so the angle theta equals zero degrees, and the cosine of zero degrees equals 1.

而ds与磁场方向相同，因此角度θ等于0度，0度的余弦等于1。