On the other hand, temperature, volume and pressure are variables that are much easier in the lab to keep constant.

另一方面，温度，体积和压强,在实验室中比较容易保持恒定。

麻省理工公开课 - 热力学与动力学课程节选

SV And this is, of course, with constant S V.

当然在这里是保持恒定的。

麻省理工公开课 - 热力学与动力学课程节选

We said, "Let's take, for the simplest case that we can possibly imagine, namely a particle moving in one dimension along the x-axis with a constant acceleration a.

我们说过,"考虑我们可以想象的最简单的情况,即质点在一维空间运动,沿着 x 轴且保持恒定加速度 a

耶鲁公开课 - 基础物理课程节选

Experimentally, though, that's not such an easy situation to arrange.

但是保持熵恒定在实验上很难实现，当然保持温度。

麻省理工公开课 - 热力学与动力学课程节选

P This is constant S and p.

在这里保持恒定的S和。

麻省理工公开课 - 热力学与动力学课程节选