或许在街上你们低声细语，但在这里不应该这样，这是另一个系统，我们有一个恒定的外压强。

I mean maybe up the street we whisper, but here we know it. And, so here is a different kind of system where we have a constant external pressure.

youdao

好，现在系统有恒定的温度，因为它是绝热的。

OK, so we have constant temperature, because it's isothermal.

youdao

这些物理系统的测试依赖于对作用力、质量和能量守恒定律的标准设计实践。

Design and testing of these physical systems rely on standard design practices that employ the laws of conservation of force, mass, and energy.

youdao

So, and of course, you know, keeping entropy as a fixed variable for a system like that is extremely cumbersome.

所以，对这样的系统要求它们的熵保持恒定,和一个非常笨拙做法。

麻省理工公开课 - 热力学与动力学课程节选

OK, so we have constant temperature, because it's isothermal.

好，现在系统有恒定的温度，因为它是绝热的。

麻省理工公开课 - 热力学与动力学课程节选

I mean maybe up the street we whisper, but here we know it. And, so here is a different kind of system where we have a constant external pressure.

或许在街上你们低声细语，但在这里不应该这样，这是另一个系统,我们有一个恒定的外压强。

麻省理工公开课 - 热力学与动力学课程节选