a leading card的用法和样例：
- My colleague David,as a leading card,has subscribed$30.000.
- My colleague David, as a leading card, has subscribed$30.000.
- A leading card; exemplar; lead; model; typeOne that is typical or representative; an example.
- The Weimar government stipulated perfect system for the school political education and inaugurated a leading card with systematic political education in the history of Germany.
- She was dressed by a leading New York designer.