This is an extraordinary and little realized truth.

To date, it is little known, little researched and little exploited.

However, this social institution is not sufficiently studied.

The mating behavior of this species is insufficiently explored.

Again, the behavior of this species is poorly studied.

The behavior of this species is apparently not well studied.

The regime in question is not well explored experimentally.

Barkilphedro, once a candidate for orders, had studied a little of everything.

The diaphragm has been found as a result of an investigation on the material of a diaphragm which has been little studied.

Osteopathy is a fascinating and little-studied medical field.

Have you not studied they history of the 20th century?

I have studied the Quran and the history of Islam.

I have read the Koran and studied the history of Islam.

Why is it such an understudied political phenomenon?

However, this phenomenon has been little taken into account up to now as a focus of study [8].