well-understood

It has some promising data behind it, but why it appears to function is not well understood.

It was a cacophony of carnage, if you will, but one well understood by the central antagonists.

This gets to something important and not very well understood.

It is an invitation for an Israeli response—as organizations like the Israel Peace Initiative have well understood.

Keynes well understood the attractions of Communism to the affluent young.

A well understood distinction exists between the calling of regular and special meetings.

The value and use of guano are now so well understood, that it is scarcely necessary to enlarge on the mode of its application.

The circumstances which must be attended to in order to do this are sufficiently well understood.

Now it is well understood that in many positions this system is the simplest and most economical method of bridging.

“Biology” is not so well understood as “botany,” though it is a more general term.