Cycloolefins play an important role in organic chemistry.

Autophagy is one of the self-digestive actions of cells.

He was crowdsurfing at the concert.

He enjoyed crowdsurfing at the concert.

Macrophages are a type of cell that engulfs foreign substances in the body.

This story is divided into three parts.

He is good at reading piano music.

He touched her hand.

He went to Tokyo to visit a friend.

He attached his name tag to his jacket.