I think his success is a good omen.

I always keep my notebook in my pocket.

He continues to search for the secret of longevity.

This dynasty lasted for centuries.

The atmosphere of this song is very calming, isn't it?

The air conditioning in this room is very efficient.

He is the ringleader of this plan.

The archeopteryx is considered the first ancestor of birds.

May I add your contact information to my address book?

He became a billionaire at a young age.