The Shanghai World Expo 2010 opens this Saturday, and organizers have been holding previews all week. Approximately “70 percent of the nearly 200 participants participated in the trials, and visitors were already encountering long lines.” Video after the break. Click here for first picture in gallery.

Officials now estimate the 6-month event, themed “Better City, Better Life”, will attract up to 100 million visitors, 95 percent of them Chinese. Shanghai has spent 400 billion yuan (58.6 billion US dollars) preparing for the Expo.

[via Boston]