We must seek rapid growth of Afghan national security forces, and that is the army and the police, and we must improve their effectiveness and our own through closer partnering, and this means we must plan together, live together, operate together and take advantage of each other's strengths as we move forward,".

VOA: standard.2009.10.01

And know intuitively that if they move together, they will behave like an object of mass 5 and the acceleration will again be 2.

凭直觉认为既然它们一起运动,那么它们就相当于一个质量为 5 千克的物体,然后我们可以算出加速度为 2

耶鲁公开课 - 基础物理课程节选

One way is to just use your common sense and realize that if you push it this way, these two guys are going to move together.

第一种方法就是你可以通过常识感觉到,如果你这样推它,这两个物体会一起运动

耶鲁公开课 - 基础物理课程节选

.. The more they covary--they move together-- the less they cancel out.

共变的趋向越大。。。它们一同增减-,风险越不会抵消。

耶鲁公开课 - 金融市场课程节选

And from there, maybe there will be some possibility to move forward together.

从这时开始，可能,就有机会继续交流。

普林斯顿公开课 - 人性课程节选

Covariance is a measure of how much two variables move together.

协方差衡量的是两个变量一起变动的情况

耶鲁公开课 - 金融市场课程节选

A positive covariance means that the two move together.

一个正值的协方差表示两个变量同向变动

耶鲁公开课 - 金融市场课程节选

If they tend to move together, when x is high and y is high together at the same time, then the covariance will tend to be a positive number.

如果x和y同向变动,当x值和y值同时都很大,协方差的结果将会是一个正值

耶鲁公开课 - 金融市场课程节选

The different stocks tend to move up and down together.

不同的股票会同时涨跌。

耶鲁公开课 - 金融市场课程节选