I guess that is an immutable law of relationships.

我想这是一个不可改变的法律关系。

youdao

In the past, the present and the future, this is an immutable law and principles.

无论过去、现在和将来，这都是一条永恒不变的法则和原则。

youdao

But the immutable law of software development is that best practices are always evolving.

但是软件开发的永恒法则就是：最佳实践总是在不断变化。

youdao

Our system, therefore, so far as regards this inferior race, rests upon this great immutable law of nature."

因此,我们政府在对待这一劣等种族时,必须以这一永恒的自然规律为基础"

耶鲁公开课 - 美国内战与重建课程节选

This suggests that the familiar bell-shaped curve reflects no immutable law, and that intelligent government policies might well help to reduce pollution levels even while countries are still relatively poor.

ECONOMIST: Local difficulties