a supporting actor的用法和样例：
- Writer and commentator Norman mailer made the point after the last presidential election that Bill Clinton won because he projected the image of a Hollywood star, while Bob Dole lost because he came across as a supporting actor.
- A support for the head, as at the back of a chair.
- The hand used as a support to steady the cue.
- A supporting stalk, such as a peduncle or pedicel.
- A square bar used as a support for a topmast.
- A supporter of the rights and power of the people.