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

Sometimes it was spiritualized. In this sense, this is why I put this quote up on the board from On the Road: "We've got to go someplace, find something."

有时候这是精神化的，从这个意义上去理解，所以我把《在路上》里的这句话写在黑板上：,我们必须去到某个地方，发现某些东西“

耶鲁公开课 - 1945年后的美国小说课程节选

That's the finger thing from left finger to right finger going back and forth across the board, never touching a number more than once.

在合并时，我的左手手指,和右手手指来回地在黑板上移动，但对每个数字只会碰到一次。

哈佛公开课 - 计算机科学课程节选