For example, if we're talking about a pitcher, like Matsuzaka, we might want to know the speed of his average fastball.

举例来说，如果我们谈到一个投手，就像松阪，我们想知道他投出,快球的平均速度。

麻省理工公开课 - 化学原理课程节选

I would expect, whether you're a Red Sox fan or not, you to be able to look at a list of different pitchers and their average velocity for their fastball, and tell me who has the longest or the shortest wavelength.

无论你是否是一个红袜队球迷，我预想你会看到一系列,不同的投手和他们,投出快球的平均速度，告诉我谁有最长的,或者最短的波长。

麻省理工公开课 - 化学原理课程节选

It's sort of pick up and has averaged about 6% 6% for about...for the last 25 years.

这时才开始迅速发展%,在最近的25年平均增长速度为。

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It's growing very, very quickly, much faster than the world average.

变化非常迅速，比世界平均速度更快。

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So you cannot tell from the average everything that happened because another way to get the same 0 is to just not move at all.

所以说平均速度并不能提供所有的信息,因为完全静止所得出的结果也是0

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So, the average velocity may not tell you the whole story.

平均速度可能无法描述整个运动过程

耶鲁公开课 - 基础物理课程节选

So it's useful to have the average velocity.

平均速度还是很有用的

耶鲁公开课 - 基础物理课程节选

So the average is what it is.

这就是平均速度

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For example, if you started here and you did all this and you came back here, the average velocity would be zero, because you start and end at the same value of x, you get something; 0 divided by time will still be 0.

例如,如果你从这里开始运动,经过这个过程又回到这里,平均速度就是0,因为初态和末态的位移相同,你得到了什么呢,0除以时间还是0

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So, the two most elementary ideas you learn are what is the average velocity of an object, as then ordered by the symbol v-bar.

你们学过的两个最基本的概念是,物体的平均速度,用"v拔"表示

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So, the average is found by taking two instants in time, say t1 and later t2, and you find out where it was at t2 minus where it was at t1 and divide by the time.

平均速度就是取两个时刻,比如t1和之后的t2,用t2时刻的位移,减去t1时刻的位移,再除以这段时间

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