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

Here we're talking about a hydrogen atom and that's what we'll focus on today. And it's incredibly precise and we're able to make the predictions and match them with experiment.

是一个氢原子，我们今天都主要讨论它,它非常准确，我们可以做出,预测与实验比较，此外。

麻省理工公开课 - 化学原理课程节选