a heart surgeon的用法和样例：
- When you have a coronary or heart attack you'll be able to shop around for a heart surgeon-- if you have the time.
- Michael DeBakey performed more than sixty thousand operations during his long career as a heart surgeon.
- He's still convalescing from a heart attack.
- This boy is being treated for a heart condition.
- He was a despot with a heart of granite.