In each chapter, he gives an example of how each idea can apply to a real life situation.

But all the old ideas of the class struggle still apply, he added.

The idea of the food chain applies here to an extent.

Any ideas you may have about sand or other materials on Earth won't apply here; this stuff is more like a liquid.

It should be unnecessary to insist that the above ideas apply only to the Absolute.

Except that the idea of any rescuer didn't quite apply.

For a small country like Lithuania, traditional ideas of defense do not apply.

I was faced with the unfortunate conclusion that both ideas applied to my current situation.

However, I would imagine the basic idea applies to all of them.

This same idea applies to all areas of science, and in some places you'll find it more prominently than others.