A keen sense of humor的用法和样例：
- He and his friend have a keen sense of humor.
- The blind have a keen sense of touch.
- Dogs have a keen sense of smell.
- Although he was quite strict about discipline within the school,he had a keen sense of humor and would delight in telling the children small stories that would make us laugh uproariously.
- Though advanced in years, he has a keen sense of hearing.