This has been a constant concern.

Their imprisonment is a constant threat to the peace process.

It is the subject of constant and tough discussion.

32207 They must stop being exposed to constant pressure.

37010 Castration not performed correctly results in constant pain.

That should set us thinking.

We must clearly set firm objectives.

We must firstly set ambitious objectives.

It cannot be set high enough.

We set fires for ecological reasons.

Very well: that is to be the unchanging rule.