You can collect stamps relating to a particular theme.您可以收集與特定主題相關(guān)的郵票。I want my café to have a special theme such as “Tang Dynasty”.我希望我的咖啡館有一個(gè)特別的主題，比如 "唐朝"。Collecting stamps with themes is especially popular among teenagers because there is a wide range of choices for them.收集主題郵票在青少年中特別流行，因?yàn)樗麄冇卸喾N選擇。