By next April,he says, all H.I.V.-infected children less than one year old will receive treatment.

VOA: special.2009.12.02

Cv So this will give us something about C sub v.

从这里可以计算出。

麻省理工公开课 - 热力学与动力学课程节选

If you took the derivative of this, you will get the velocity at time t, it would be: v=v0+at.

如果你对它求导,你就可以知道 t 时刻的速度,即,v=v0+at

耶鲁公开课 - 基础物理课程节选

Thirty-six volunteers in South Africa will test the safety of an African-developed vaccine against H.I.V.

VOA: special.2009.07.29

You know that if you took a derivative of this, you will find v of t is v0+at.

如果你对这个式子求一次导,你将会得到v=v0+at

耶鲁公开课 - 基础物理课程节选

What happens is, you will find that v^=v0^+2a times .

结果就是v^=v0^+2a

耶鲁公开课 - 基础物理课程节选

It just turns out that if you put the v^2 and you put the r, and r is 93 million miles, you will find the acceleration is small enough for us to ignore.

这样的话,如果你把 v^2 和 r 代进去,r 是 9300 万英里,你会发现加速度小得足以被忽略

耶鲁公开课 - 基础物理课程节选