回答

・stamp rally
・stamp collecting

「紀念印章收集 」英語叫做 stamp rally 和 stamp collecting 來表達。

I think there are people who collect stamps by stamping them on stamp rally cardboard.
（我認為有人在紀念印章收集紙上蓋章來收集）
※cardboard（硬紙板，卡紙板）

My hobby is stamp collecting, so I know a lot about it.
（我的興趣是集章，所以我對紀念印章收集很了解。）

有幫助｜0