He is doing a special exercise to strengthen his internal intercostal muscles.

The internal obturator muscle is part of the pelvic muscles and is mainly involved in stabilizing the hip joint.

The internal anal sphincter is a muscle that helps us control defecation.

The internal urethral sphincter plays a crucial role in controlling the flow of urine.

I am planning to go to Inner Mongolia, an autonomous region of China, next week.

The balance of intestinal bacteria greatly affects health.

He is an expert in musicology.

This room is covered with soundproofing material, so the sound doesn't leak outside.

He honked the car horn to get my attention.

The treble clef is often used in musical scores.