而它们中的一些保持恒定不变，因变量按某种自然的方式变化，从而维持约束条件。

Some of them are held fixed, and then some dependent variable does whatever it must so that the constraint keeps holding.

youdao

感谢特殊的隐形眼镜、藏于衣服内的电脑和分散于你到过的各处的位置传感器，你可以看到一个恒定不变的信息流和覆盖于真实世界之上的虚拟景象。

Thanks to special contact lenses, computers in your clothes and locational sensors scattered everywhere you go, you see a constant stream of text and virtual sights overlaying the real world.

youdao

首先发布的是狭义相对论，它的基础是对于任何一个人来说，光速是恒定不变的。

Special relativity came first and is based on the speed of light being constant for everyone.

youdao