我们认为时间是固定不变的，但世界上并没有什么东西是固定不变的。

We think of time as a constant, but there is nothing constant about it.

youdao

确定词干是查找单词中不变部分的过程，它是单词中与时态和语气无关的保持不变的片断。

Stemming is the process of finding the constant part of a word, which is the fragment that stays the same no matter which word tense or mode is used.

youdao

然而，棋盘的格子和进攻，防守，捉子，弃子的规则保持不变，以任何代价取得胜利保持不变。

Yet the grid remained and the rules remained: attack, defend, capture, sacrifice. Win at all costs.

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