She lowered her eyebrows using the depressor supercilii.

He is doing a special exercise to strengthen his subscapularis muscle.

The infrahyoid muscle is a part of the neck muscles, and it has the role of pulling the hyoid bone downward.

I go to the gym every day to build my muscles.

This river is three long.

She started a special exercise to strengthen the incisivus labii inferioris muscle.

He is brushing his lower teeth.

He smiled, showing his lower teeth.

She seemed nervous, biting her lower lip.

She seemed nervous, biting her lower lip.