patch collecting造句

In the U . S ., the development of the National parks system and the growing popularity of vacationing saw a similar development of patch collecting.
The publishing of reference books on law enforcement insignia over the past decade has made law enforcement patch collecting a popular way to preserve law enforcement history.
Another patch collecting specialty is police agencies such as sheriff, police, highway patrol, marshal, constable, park rangers, law enforcement explorer scouts, or other law enforcement related personnel.
It's difficult to find patch collecting in a sentence. 用patch collecting造句挺难的