He is the center of the team.

Please be careful as the platform door is closing.

This train has a selective door operation feature.

The swing door was opening and closing in the wind.

He treats us as a big friend.

He is known as an expert in library science.

She works as a librarian.

His luck finally turned, and he got his dream job.

He said 'Open Sesame' as if by magic, and the door opened.

He shouted 'open sesame' towards the secret door.