a doctor of science的用法和样例：
- A veterinary surgeon is a doctor of a sort.
- He qualified as a doctor of physics this year.
- He wants to make a doctor of his son.
- Schmidt, who holds a doctorate from the University of California at Berkeley, also received an honorary doctor of science degree at the ceremony.
- Wang is a doctor of philosophy in physics.
- She had a good friend who was a doctor of laws.