最后，不变条件测试断言永远不变的条件。

Finally, invariant tests assert conditions that never change.

youdao

这点保持不变，但是纯滚动中，这不变。

This part always holds, but for pure roll, this holds.

youdao

所以现在回复力加倍，物体质量加倍，加速度不变，周期不变。

So now the restoring force doubles and the mass doubles, the acceleration remains the same, the period remains the same.

youdao

You know, it's like lots of courses and all sorts of things that you're seeing, they're always the same.

你们知道，就像其它很多课程,和其它东西一样，都是不变的。

麻省理工公开课 - 热力学与动力学课程节选

Now as soon as we start talking about things like the dominant, we are also aware of the evanescence of dominance.

说到支配性，我们就必须认识到支配并不是不变的。

耶鲁公开课 - 文学理论导论课程节选

Now for this experiment, this is a constant enthalpy experiment for the Joule-Thomson experiment, this is equal to zero.

对于这个实验，焦耳-汤姆逊实验,是一个焓不变的实验,焓变化等于0，所以我可以。

麻省理工公开课 - 热力学与动力学课程节选