He is doing special exercises to strengthen his depressor muscle.

The inferior gemellus muscle is a part of the human body, mainly supporting the movement from the waist to the leg.

He is doing a special exercise to strengthen the subclavius muscle.

He collapsed due to a subarachnoid hemorrhage.

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.