He is playing the character of Bun.

Infrared astronomy provides a new perspective on understanding the universe.

This problem is difficult.

What does this sentence mean?

He cut the apple.

He rejoiced when he heard about the success.

He is interested in ichthyological research.

Knock-knock, someone is knocking on the door.

Thinking sensibly, that plan will not succeed.

He fell while skiing and broke his rib.