He was named the league's 'most valuable player'. [=the player who contributes the most to his team's success]
Clean air is a 'valuable' natural resource that needs to be protected.
A lot of 'valuable' advice/information can be found in this book.
(..) I guess I should have caught on I mean, how clean can teeth get? My brother's going through that right now, he's such a mess. How did you get through it? Well, you might try accidentally breaking something valuable of hers, - say her... - ...leg? That's one way! Me, I- I went for the watch. (..)1994 TvShow: Friends Title: The One Where Monica Gets a Roommate Season: 1 Episode 1