a well-known actor的用法和样例：
- Charles Dickens was a well known writer.
- He is a well known doctor who has his own clinic.
- It has become a well known holiday resort.
- Xiao Ming is a well known skinny boy in our school.
- That's right, kiddies, its time to pull out the Emergency Well Known Actor Alert system, and boy we have a triple header here, buckos.