OK, so far we are pretty happy. Now let's do a change of variables.

现在还是皆大欢喜，对变量做一点变化。

youdao

But, once you've reduced it to an actual change of variables problem, I expect you to be able to know how to do it.

不过，用变量替换的办法来做的话。。。,希望你们能知道怎么去做这种题。

youdao

So anyway, this is the origin, and then the last side, y equals zero, x So, somehow, in the change of variables, this square becomes this triangle.

变成另一个点，无论如何，这就是原点，最后一条边，y=0，一直变化，最终变成了v=0，and，x，varies，just，becomes，v，equals，zero。,所以，在变量替换的过程中，这个正方形变成了三角形。

youdao

So what they do is, they're describing how these thermodynamic properties change, in terms of only state functions and state variables.

他们的作用是描述,随着状态函数和状态变量的变化，系统的热力性质如何变化。

麻省理工公开课 - 热力学与动力学课程节选

If any of the variables change, Fair Value changes overnight.

FORBES: It's Time To Sell Strength To Risky Levels

Putting humans in a vehicle with millions of parts, atop thousands of pounds of explosives, and then operating it at high speeds while monitoring thousands of variables that rapidly change is hard stuff.

FORBES: Why Is Privatized Space Travel A Challenge?

Clothing makers looking to monitor and optimize social-media marketing campaigns involving tens of millions of socially connected consumers, thousands of SKUs, tens of thousands of retail outlets, and a booming online presence have to be able to make decisions across all of those variables as quickly and unexpectedly as those millions of consumers change their minds.

FORBES: OracleVoice: You Can Get A Chip Slower Than The New Sparc T5, You Just Have To Pay More