I picked up a leaflet at the museum that explained the history of the exhibit.

leaflet 是由名词 leaf（叶子）加上指小后缀 -let 构成的名词，字面意思是"小叶子"，引申为"小册子、传单"，指单张或折叠的印刷品，通常用于宣传或提供信息。