One part is important.

He read the Thousand and One Nights and was drawn to the charm of the Orient.

He was observing the distant birds using binoculars.

English is widely used as a common language in the world.

He read the small print using a magnifying glass.

He is reading the daily scripture.

I used binoculars to observe birds in the mountains.

The study of phonons is an important field in physics.

This factory is our main source of supply.

That battlefield was truly a hell of agonizing cries.