Experts say Ronald Reagan re-defined the American presidency during his two terms in the nineteen eighties.

VOA: special.2011.02.06

And he defined the average in terms of not the sum divided by two, but he chose the geometric mean.

鲍林定义平均并不是,简单相加在除以二，他选择几何平均。

麻省理工公开课 - 固态化学导论课程节选

The mole is something that was also defined in terms of carbon.

我们也以碳来,定义摩尔。

麻省理工公开课 - 固态化学导论课程节选

Alright. So, since we have these terms defined, we know the frequency and the wavelength, it turns out we can also think about the speed of the wave, and specifically of a light wave, and speed and is just equal to the distance that's traveled divided by the time the elapsed.

好了，我们已经定义了，这些术语，我们知道了，频率和波长，现在可以来考虑,波的速度了，特别是光波的速度，速度等于它走过的距离,除以所用的时间，因为我们。

麻省理工公开课 - 化学原理课程节选

This is only defined in terms of state functions.

但是他们只是态函数。

麻省理工公开课 - 热力学与动力学课程节选

So, it looks like the curry and some other items were really precisely defined in terms of price and this is of course has generated this receipt - by some computer, some cash-- cash register and they just didn't account for the inherent imprecision so here is a perhaps real world incarnation of that.

看起来咖喱,和其他一些东西都被明确地定价,这当然可以,通过计算机-,收银机生成这份收据，而且它们并不对,其内在的不精确性负责,这可能就是现实世界中的一个典型。

哈佛公开课 - 计算机科学课程节选