a ping-pong champion的用法和样例：
- It WAS a ping pong game in Rec. cabin, however, it turned into Rosey's ping pong game...
- Enlarged adenoids can become nearly the size of a ping pong ball and completely block airflow through the nasal passages.
- Moreover, kinetic studies of the amidase catalyzed acyl transfer reaction demonstrated that the reaction occurred according to a Ping Pong Bi Bi mechanism.
- A neat segue using ping pong reference (a very popular sport in China), a ping pong ball (as in the NBA draft lottery) and how they both eased the relationship between East and West.
- We played ping pong with the world champion Lao Wa.