And now you will understand how we define the instantaneous velocity at time t which is different from an average velocity between two time intervals.

现在明白了吗，t时刻，的瞬时速度是怎样定义的，与两时刻间的平均速度相比，瞬时速度并不一样。

youdao

Although velocity varies among different plate, plate heat exchanger in the change of heat and fluid resistance calculation, is still at an average velocity to calculate.

虽然板式换热器各板间流速不等，但在换热和流体阻力计算时，仍以平均流速进行计算。

youdao

Previous findings demonstrated that a reduced improvement in coronary flow velocity reserve due to an increase of baseline average peak velocity was linked to cardiac biomarker elevation, they add.

以前的研究证实降低冠脉流速可以增加平均血液流速贮备，导致心肌生物标志物增加。

youdao

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

耶鲁公开课 - 基础物理课程节选

Coming back from offseason elbow surgery, he entered with an average fastball velocity of 90.2 mph this season, according to fangraphs.com.

WSJ: Yanks beat Boston 4-1 as Teixeira, Youkilis return