He is using binoculars to observe birds.

The geology of this area is mainly composed of tuff.

She attempted facesitting on him.

Infrared astronomy provides a new perspective on understanding the universe.

This problem is difficult.

What does this sentence mean?

He is playing the character of Bun.

Gidōsanshimō is a courtesy name of Takashina no Kishi.

He injured his extensor pollicis longus.

He underwent surgery due to an injury to his extensor pollicis brevis.