+4 Because this could be three plus four, 3 times five, or it could be three, plus four times five.

因为这可能是，然后乘以5，也可能是，加上4乘以5。

麻省理工公开课 - 计算机科学及编程导论课程节选

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

This point here then is the present value of your income; it's Y today + / .

直线与x轴的交点表示收入的现值,它等于

耶鲁公开课 - 金融市场课程节选

So we are really looking at this reaction here H+ for ionization. It is H gas neutral goes to H plus in the gas phase plus the electron. And, furthermore, we can have multiple ionization energies.

所以我们真正看到的是,电离，它是在气相中H变为,和电子的过程，还有，我们能电离能加倍。

麻省理工公开课 - 固态化学导论课程节选

This is A + A. We're going to call it 2A.

这就是 A + A,我们也把它称为 2A

耶鲁公开课 - 基础物理课程节选