我曾在《华盛顿邮报》工作过一小段时间。

I spent a brief spell on the Washington Post.

《牛津词典》

但是我们也将去上海一小段时间。

But we'll also do a short visit to.

youdao

按住一小段时间如下图所示。

Press a few times as shown below.

youdao

He said, first, let it go a little distance, take the distance over time, that gives you the velocity now.

他说,首先,让它运动一小段距离,距离除以时间,你就能得到现在的速度

耶鲁公开课 - 基础物理课程节选

That is the whole triumph of calculus is to know that by looking at the position now, the position slightly later and taking the ratio and bringing later as close as possible to right now, we define a quantity that we can say is the velocity at this instant.

这就得靠微积分了,通过了解它现在的位置,和一小段时间以后的位置,计算它们的比,再让时间间隔尽可能缩短,我们就定义了一个,被我们称之为瞬时速度的物理量

耶鲁公开课 - 基础物理课程节选