1. The Expo passport is the hottest souvenir in the Expo Garden, which allows visitors to collect commemorative stamps of the pavilions they entered.
2. Geng says that for those who collect stamps as an investment, there are still ways to observe the rise and fall of the market value.
3. A fun aside is that the Expo has an official souvenir passport and visitors can collect stamps for the passport from the different national pavilions.
4. collect stamps的翻译
4. Some collect mascots, stamps or other souvenirs and even used tickets.