He is interested in ichthyological research.

He cut the apple.

He rejoiced when he heard about the success.

He is doing special exercises to strengthen his dorsal interosseus muscle.

The palmar interosseus muscle is a part of the hand muscles and supports the movement of the fingers.

The plantar interosseus muscle is a part of the foot muscles and controls the movement of the toes.

His suspicious looking behavior made me uneasy.

He used a tie to bind two things together.

Shu never missed a day of training, striving to maintain his self-discipline.

Moderate exercise is good for health.