Aishinka is my best friend.

He is working on the project wholeheartedly.

The doctor used an electrocardiograph to check the condition of my heart.

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.