This pen is 15 centimeters long.

He is known as a troublemaker in the class.

His knowledge is extensive, and he can talk about any topic.

I enjoyed the beautiful rural scenery while walking along the ridge.

He is worried about his job.

He is doing a special exercise to strengthen his extensor carpi radialis brevis.

The extensor carpi radialis longus is a part of the arm muscles and helps in the movement of the wrist.

Sentarou fell asleep while watching TV.

Please stop inquiring about his private life.

He was standing by the side of the incident, doing nothing.