And we can go through and calculate the value of this quantity in parenthesis. And, when we do so, we get the value 2.18 times 10 to the minus 18 joules.

我们能进行计算这些值,如果我们这样做，我们能算出是，2。18，乘以10，的负18焦耳。

麻省理工公开课 - 固态化学导论课程节选

The basic definition-- the expected value of some random variable x--E--I guess I should have said that a random variable is a quantity that takes on value.

最基本的定义,某一个随机变量X的期望值E,我应该提到过,随机变量是一个可以取值的数

耶鲁公开课 - 金融市场课程节选